查询词典 difficult to

Because the teen-agers are being in the important stage of socialization, their psychogenesis still are not perfect, their mental mechanism are not mature, they are often difficult to make the correct choice and judgment in the contemporary complex internet environment in which they are in the face of varied information ,which results to the deviation of their target of socialization which they should reach to .

青少年正处于社会化过程的重要阶段，生理发育尚不健全，心理机制尚不成熟，因而在当代纷繁的网络媒介环境中，他们面对各种信息，常常难以做出正确的选择与判断，迷失在信息海洋里，出现社会化的偏离。

Well I could put a little glue on the screw to stop it from loosening but that would make it difficult to take the lenses out if you want to change them in the future

我可以在镙丝钉上放少许胶水以防它再松开。但如果你以后想把镜片拿出来更换便会困难一点了）。

It can be seen form the results of the experiment that the method oftwo-wavelength pyrometry can be used to measure the rod-like cathode temperature.But this method has a big difficulty which is that it is difficult to separate the radiationflux due to cathode reflecting from the total radiation flux in the experiment.

在实验中，我们测出了不同情况下的阴极温度分布；实验结果显示，双波长高温测量方法能很好地测量棒状阴极的温度，但是双波长高温测量方法存在着一个的很大困难是：在实验中，很难将阴极表面反射的辐射通量从总的辐射通量中分离出来。

To verify the performance of MCBA, we study two cases. The first case is a G/G/1 queuing problem with the optimal parameter setting difficult to determine. The second case has an additional binary decision variable representing two different dispatching rules. Compared with the results of Optimal Computing Budget Allocation, the proposed approach is observed to achieve higher probability of correct selection under the same simulation cost.

为了验证我们方法，我们用了两个例子，第一个例子是在G/G/1系统搜寻一组难以找到最佳参数的例子，第二个例子则是延续第一个例子，额外加进了另一个二元因子，代表不同的派工法则，跟另一个方法OCBA比较后，可以发现我们的方法能够获得较高的正确选择机率，在相同的模拟资源下。

Many teachers prefer to teach Rhythm, as the first dance – because the weight changes on beat 3 in Waltz are more difficult to master, and you can gradually speed up the music as they become proficient so that they can dance to Quickstep music.

许多教师都会倾向于先教授社交韵律舞，原因如下：（1）华尔兹第三拍中的重心变换掌握起来难度更大；（2）社交韵律舞教学中，学生熟练之后可以逐渐加快音乐，这样学生就能跟上快步的音乐。

The motionless backgroup situation usually happens at the video camera parked to opposite quiescent condition , the first wipe off yawp by using pretreatment method,the second using the method of difference Statistic in two frame to analyse and compute background , Above this base to utilize the resumeed background and present frame message detect movement target and it"s movement track ; In dynamic backgroup movement image,it is very difficult to exactly compute ground since the background is varied complexly , the article research the optical flow model、 background model、 moving object detection based on entropy,and depart target from background in movement picture , detect moving target and plain it"s track.

静止背景的情况通常发生在摄像机相对静止状态，首先用预处理的方法去除噪声，其次采用帧间差分统计的方法进行分析计算背景，在此基础之上利用恢复的背景及当前帧的信息检测运动目标及其运动轨迹；对于动态背景的运动图像，由于背景是不断变化且呈现出复杂的特征，因此很难准确求出静止背景，本文在光流矢量场和配准方法的基础上探讨研究了光流模型、背景模型和基于熵的方法，在动态图像上分离不同的目标与背景，直接检测出运动目标并画出相应的轨迹。针对运动图像的复杂性，本文提出了构建模型知识库的设想。

F-10B in the structure is basically designed to develop into a carrier-based fighters with the basic conditions, structure, aerodynamic and performance is also better balances the needs of carrier aircraft, but the single fighter to improve the structure of growth for the carrier aircraft re-issue of it is difficult to eliminate, J -10 with the AL-31FN engines on the J--10 There is just another shortcoming of lack of thrust.

歼-10B在结构设计上基本上具备了发展成舰载战斗机的基础条件，结构、气动和性能方面也比较好的均衡了舰载机的需要，但单发战斗机改进为舰载机的结构增重问题的影响却很难消除，歼-10采用的AL-31FN发动机对歼-10来说恰恰又存在推力不足的缺陷。

Difficult to rearouse the oxygen by itself, hydrogen readily combines withoxygen to form runing water, which can be heated to steam and easily rearoused.

虽然单独除去氧本身是困难的，氢和氧很简易结合成水，而水是没去外国疑问加热蒸发除去的。

Difficult to rearouse the oxygen by itself, hydrogen easystily combines dawnoxygen to tom runing waterdrop, which can be heated to steam or normally rearoemployed.

虽然单独除去氧本身是困难的，氢和氧很简易结合成水，而水是没去西方国家国家疑题加热蒸发除去的。

It may be due to the following two reasons: 1 High steric hindrance caused by rigid structure of substituted fluorenone preventsthe approach of the chiral reductor;2 The prochiral center is, moreover, linked to two coplanar aromatic rings, which due to strong conjugation are highly electronically similar and thus it becomes extremely difficult to distinguish between them.

主要是以下两个原因：1取代芴酮的刚性结构产生高的空间位阻，阻止了手性催化剂的接近；2潜手性中心旁的两个芳香环不仅立体构型非常相似，而且高度的电子相似，很难被手性配体识别。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷