向后的

This section presents two kinds of characteristic schemes, one is the natural use of the usual backward Euler characteristic difference scheme ( [60] ) onto the triangular mesh, the other replaces the backward Euler's method by modified Euler formula to approximate the characteristic differential equation, so that the discretization for characteristic curve can get up to second order accuracy.

本节给出了两种三角形网格上的特征差分格式，第一种是通常的向后Euler型特征差分格式（[60]）在三角形网格上的自然运用，第二种采用§3.3、§3.4的离散思想，使用改进的Euler公式代替向后Euler公式来近似特征微分方程，使其对特征线的离散达到了二阶精度。

Douglas and Russell first presented the idea of characteristics in[13],in whichthe diffusion term is included in the derivative of characteristic direction of the solu-tion and the backward difference quotient along the time axis was replaced by it alongcharacteristic direction.

Douglas，Russell[13]最先提出了特征法的思想，其主要特点是将模型方程的对流项隐含在解沿特征方向的导数之中，以沿特征方向的向后差商逼近取代通常方法中沿时间方向的向后差商逼近。

The Invid's snout dropped open when he saw Wolff standing there armed to the teeth, and he immediately fell backward against his coconspirator, hoping Wolff would read it as Burak attempting a capture.

因维人看到沃尔夫全副武装站在那里时，尖嘴惊讶地张开合不拢，随后立刻向后摔倒，倒向自己的同谋，希望沃尔夫会以为伯拉克在擒拿他。

This algorithm replace the traditional forword, and backword_ character-to-character conditional probabilities with forword_ and backword. character-to-syllable conditional probabilities so that the space of data-base may be greatly reduced and the efficiency of searching the best solutions is also improved.

摘要］ 本文论述了一种新的汉语音字转换的概率后处理算法，该算法用字相对于前后向拼音的条件概率代替常见的字相对于前后向汉字的条件概率，极大地压缩了数据空间，提高了查找效率，使概率后处理的实时应用更趋于现实。

In scales toward the extremes of the keyboard the upper arm uses small, pendulumlike motions while the body moves forward; in scales toward the center it will stay out at all times, away from the body as far as necessary while the body leans backward.

向键盘两端走向的音阶弹奏不太利用上臂，当身体向前运动时有点钟摆式的动作；音阶走向键盘中心弹奏时，上臂一直向外伸出，当身体向后倾斜时，上臂需要尽可能远离身体。

The simulation results shows that when the hydroforming for real axle housing needs two bulge processes and the specific value of the two bulge ratio is about 1, the result is the best one; To obtain an appropriate route of loading force need adjust internal pressure and axial compression force for many times and according to the failure, the size of the two forces which has been mentioned can be rapidly and rationally adjusted; Because of good greasing conditions influencing largely, reducing the friction between tube blank and die inside surface as well as possibly not only makes more materials flow into the bulge area but effectively diminishes the axial compression force; The good or bad characteristics of tube blank material is also one of the decisive factors and when material is selected, we first consider its' formability.

模拟结果表明，当后桥壳需要两次进行胀形，两次胀形比比值约等于1时，胀形结果最好；合适的加载路径要经过多次调试，能根据胀形缺陷对内压力和轴向力的大小进行迅速地合理调整；良好的润滑环境对后桥壳液压胀形的影响巨大，要尽量减小管坯与模腔内壁的摩擦力，不但使更多的材料流入胀形区，而且能有效的降低轴向力的大小；管坯材料性能的好坏也是影响胀形的决定性因素，选材时首先要考虑材料的成形性。

Hotel brokers dragged staggering pace, with a look of exhaustion luggage into the station, one that is open to police to borrow money that is太岁头上动土encountered fraud syndicate, police did not believe the beginning, after the investigation turned out that name of the hotel brokers before working in Hong Kong to Taichung, after work has been unable to find a new job, spend money and helpless body, and want to go home but no money to ride, forced only to adults for help we the Boli Shi, raising more than 500 police vehicles block the money to the hotel brokers , good people to do in the end, and also patrol car with the hotel brokers to the station to ride bow deeply to the police adult Thank you kindly, hotel broker promised to find a job after returning Kaohsiung made money, some Taichung peace will return to the police station to thank the police who help him.

酒店经纪拖著蹒跚的步伐，带著行李一脸疲惫走进派出所，一开口就是要向员警借钱以为是太岁头上动土，遇到了诈骗集团，员警一开始还不相信，事后调查原来这名酒店经纪日前到台中港打工，工作结束后一直找不到新的工作，无奈身上的钱又花光了，想回家却没钱坐车，不得已只好向咱们的波丽士大人求助了，员警集资五百多块的车钱给酒店经纪，好人做到底，同时还用巡逻车载酒店经纪到车站搭车深深一鞠躬谢谢好心的警察大人，酒店经纪允诺回高雄后找到工作赚了钱，一定会回台中安宁派出所来谢谢帮助他的员警们。

Hotel brokers dragged staggering pace, with a look of exhaustion luggage into the station, one that is open to police to borrow money that is太岁头上动土encountered fraud syndicate, police did not believe the beginning, after the investigation turned out that name of the hotel brokers before working in Hong Kong to Taichung, after work has been unable to find a new job, spend money and helpless body, and want to go home but no money to ride, forced only to adults for help we the Boli Shi, raising more than 500 police vehicles block the money to the hotel brokers , good people to do in the end, and also patrol car with the hotel brokers to the station to ride bow deeply to the police adult Thank you kindly, hotel broker promised to find a job after returning Kaohsiung made money, some Taichung peace will return to the police station to thank members of the police who help him.

酒店经纪拖著蹒跚的步伐，带著行李一脸疲惫走进派出所，一开口就是要向员警借钱以为是太岁头上动土，遇到了诈骗集团，员警一开始还不相信，事后调查原来这名酒店经纪日前到台中港打工，工作结束后一直找不到新的工作，无奈身上的钱又花光了，想回家却没钱坐车，不得已只好向咱们的波丽士大人求助了，员警集资五百多块的车钱给酒店经纪，好人做到底，同时还用巡逻车载酒店经纪到车站搭车深深一鞠躬谢谢好心的警察大人，酒店经纪允诺回高雄后找到工作赚了钱，一定会回台中安宁派出所来谢谢帮助他的员警们。

The simulations for the obtaining result in Ku wave band show that the size of the pricipal target affects greatly both the forward sactter and the backward scatter. The influence of the targets around shows definite periodicity. The second scatter field minishes with the increase of distance between two targets. The more near the forward area the rounding target is, the bigger its affect is.

结果表明：本目标的尺寸对前向散射和后向散射均有较大的影响，周围目标的影响呈现出一定的周期性，二次散射随着目标间距的增大而减小，周围目标离前向散射方向越近，对前向散射的影响也越大。

Objective To evaluate clinical effect of the handling ProTaper Nickel-titanium rotary instruments in preparation of canals of posterior teeth.Methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling ProTaper rotary instruments using step-down technique,and by K files using step-back technique for control.All teeth were obturated with lateral condensation methods.The efficiency of preparation was analyzed with ra-diographs before and after operation.

目的 评价手用ProTaper预备后牙根管的临床效果方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用ProTaper 锥度镍钛旋转器械逐步伸入法预备根管，对照组用K锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗后的X线片，评价后牙根管预备效果。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。