向地地

Before the swallow, before the daffodil, and not much later than the snowdrop, the common toad salutes the coming of spring after his own fashion, which is to emerge from a hole in the ground, where he has lain buried since the previous autumn, and crawl as rapidly as possible towards the nearest suitable patch of water.

春燕还没归来，水仙花还没绽开，经过一冬的蛰伏，蟾蜍爬出深埋地下的洞穴，向行将来到的春光致意，他沐浴着雪花莲的芬芳，迫不及待地奔向最近处的水洼。

The best research tool for the problem of option pricing is backward and forward-backward stochastic differential equation .

简要地介绍了倒向和正倒向随机微分方程在数学金融学的研究中所起的作用。

Qin Shi Huang unified the world that year, after thinking about France pleasure, but also thinking of seeking immortality of the drug, when they got here there is magic fairy mountains, the sea side of the Bohai Sea, the day he was walking, I suddenly encountered a mountain blocking the avenue, angry Qin Shi Quan then remove the drive toward the mountains Mountain Kamimuchi Mengchou three whip, immediately mountain roots, so that a road, gravel vacated, to the northeast and flew holding spur violent Thai Shi-huang stone horse fly hot pursuit to accept defeat, has been Zhuizhi sea edge, rock suddenly disappeared, and fleet groups of gorgeous tiger playing at the beach, and some claws to him descend quickly, Qin Shi Huang terrified and immediately he turned away.

当年秦始皇一统天下后，想着法寻欢作乐，又想着寻求长生不老之药，于是来到了海里有神奇仙山的渤海边，一天他正在走着，忽然遇到一座大山挡住去路，恼怒的秦始泉便取出赶山神鞭朝大山猛抽三鞭，立时山峰拔起，让出大道，碎石腾空，向东北方向飞去，狂暴的泰始皇持鞭策马紧追飞石不舍，一直追至海边，忽然巨石不见了，却见一群群的斑斓猛虎在海边嬉戏，有的还张牙舞爪地向他扑来，秦始皇惊恐万状，赶快扭头逃跑了。

To analyze the pseudo phenomena caused by migration velocity error, the paper firstly studied the depth error between post-stack migration and prestack migration caused by same velocity error, and found the depth error was only relative to velocity error and had no direct matter with methods of depth migration (post-stack migration or prestack migration). Then the paper did numerical simulation of a complex lenticular body model with wave-equation modeling and migration, and found that the velocity error could not only induce depth error, but also could change the modality of construction and the event of subjacent layers. Furthermore, it could change the frequency of reflective event. They are the pseudo phenomena caused by migration.

从分析偏移速度误差带来的各种假象出发，本文首先对比分析了速度误差对叠后深度偏移和叠前深度偏移的影响，发现偏移剖面的深度误差仅与速度模型的误差有关系，与具体的偏移方法没有直接的关系；然后对一个复杂的透镜体模型进行了波动方程叠后正演和偏移计算，详细地讨论了不同的速度误差带来的各种假象，发现速度误差不仅会带来深度误差，而且会造成构造体的形态变化，下覆地层同向轴的扭曲，还可能引起地层同向轴的频率发生变化，给资料解释带来一定的假象。

And the results indicate that the principal stress directions in study area are mainly NE-SW, and the second substage tectonic twist made the direction deflect from North to East, but the primary direction changed little; tectonic activities during the O〓～S～D stage is some violent, most of the area are under high stresses status, and rock fracture degree is correspondingly higher, as coinciding with the drill cores observation, i.

通过数值分析，模拟了塔中Ⅰ号断裂带和塔中45井三维模拟区O〓灰岩的构造应力场和应变场，结果表明：研究区主应力方向为北东～南西向，第二期的构造扭动使其由北向东发生了一定的偏转，但总的方位变化不大；O〓～S～D时期，塔中地区构造运动较强，研究区大部分处于高应力状态，岩石破裂程度较高，而岩芯观察结果也证实了这一结果，即O〓灰岩地层中早期形成的构造结构面比较发育，单个结构面的规模也较大；C～P时期，岩石的破坏程度较早期有所提高，主要表现在两个方面，一是各局部区岩石的破坏程度普遍有所提高；二是各个级别破裂区的分布范围相应地扩大了；研究区应力分布表现出明显的不均匀性，特别是剪应力，无论是O〓～S～D时期，还是C～P时期，都有很大的差异性，特别是在小断层的端部，剪应力比较集中，而且在断层的两盘，剪应力方向和大小都变化极快。

The coal bearing strata in Huainan area is situated in the south-east portion of the North China platform,a synclinorium with northwest by west.

淮南地区构造位置处于华北地台东南部，是一呈北西西向展布的复式向斜。

of comparing practical case evaluation with gas testing result is that the gas- bearing layer in VU Area can be identified by cross-plot of Poisson's ratio and compressional slowness, cross-plot of tangential stress and compressional slowness, as well as negative anomaly of tangential stress.

通过实例评价结果与试气结果的对比认为在YU地区，泊松比与纵波时差交会，切向应力与纵波时差交会，以及切向应力的负异常，均能较好地识别气层。

She quickly closed the door, ran to the kitchen, and tearfully complained to her parents and my grandmother.

她飞快地关上门向厨房跑去，边哭边向她的父母和我的祖母告状。

She quickly closed the door, ran to the kitchen, tearfully complained to her parents my grandmother.

她飞快地关上门向厨房跑去，边哭边向她的父母和我的祖母告状。

The president, Chen Yuewei, introduced some core members to us and then told us the club develop history in details. We hunged up on the prideful achievement and the most temptable club development strategy which raise our passion to show our capability.

主席陈岳伟师兄风趣地向我们介绍了组织内部的几位核心成员，然后再向我们娓娓述说了俱乐部的发展历史，大家似乎听得不亦乐乎，因为都是值得骄傲的战绩，更甚的是他还给了我们一个诱惑力十足的俱乐部发展战略，让我们听得心中此起彼伏，超想现在就大展身手一番。

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。