地面上

Do not call out, tap coins on the counter, snap your finger or wave like a drowning swimmer. Do not scowl6 or sigh or roll y our eyes.

不要大声嚷嚷，不要在吧台面上敲击钱币，不要叭叭地弹手指，不要像快淹死的人那样挥动手臂，不要绷着脸，不要唉声叹气，不要翻动眼珠。

On the still bosom of the fish-pond the same withered leaves slowly rotted away, mixing themselves with the tangled weeds that discoloured the surface of the water.

在鱼池平静的水面上，同样的枯叶在慢慢地腐朽，跟那使水面变色的紊乱水草混在一起。

A systematic study on computing the integral curvature line on NURBS surface is presented. Discrete normal is used to simplify calculation of the second fundamental form of the surface, resulting in accelerating the Euler iteration process in solving the differential equation of curvature line. Discrete points on the curvature line are then obtained and approximated by an explicitly presented B-spline curve on the NURBS surface using singular mixed interpolation and capable of controlling the error within a given tolerance.

对NURBS曲面的曲率线的积分进行了系统的公式推导，并利用NURBS曲面的离散法向量有效地简化了曲面第二基本量的计算，加速了Euler法迭代求解曲率线微分方程的过程；在求得曲率线上的离散点集以后，应用奇异混合插值技术，在可控精度内把曲率线用显式直接表示为位于NURBS曲面上的B样条曲线。

Taking an optical system with a hard-edge aperture as an example, the intensity distributions of two low modes of Hermite-Gaussian beam were simulated and numerically calculated with the mathematical software.

通过分析计算得到如下结论：对于任意一个含有硬边光阑的复杂光学系统，都可以把光阑的作用从系统中"移"出来，把其看作是出射光瞳的作用，从而可以较为简便地求出观察面上的场分布。

Covered on the surface of the sea was the cool and bright moonlight, the high-hearted sea was roaring and tiding on its own. The moonlit surface was the perfect combination of these two distant yet intimate individuals.

清冷的月光洒在海面上，清高的海在自顾自地汹涌澎湃，月光粼粼的海面，是这两个遥远而相知的个体永恒的结合。

In this thesis, we totally depict the spectrum of the Laplacian on theclosed hypersurface with constant mean curvature and constant scalar curvaturein S~4, i.e., compute all eigenvalues of such closed hypersurface.

本文完整地刻画了S~4中具有常平均曲率和常数量曲率的闭超曲面上Laplace算子的谱，即计算出这类闭超曲面的各阶特征值。

Light enters and leaves at right angles to the hypotenuse and is reflected at each of the shorter faces.

光垂直地入射和出射于棱镜的斜面，而在每一个较短的面上反射。

It is now being used indifferently for bot.

而现在，知识毫无区别地应用在两方面上。

The temporal and special cross section of MPV1 on isobaric surface can reflect the evolution of dry intrusion.

4等压面上的MPV1空间、时空剖面均能很好地描述干侵入的演变特征。

Once or twice of a night we would see a steamboat slipping along in the dark, and now and then she would belch a whole world of sparks up out of her chimbleys, and they would rain down in the river and look awful pretty; then she would turn a corner and her lights would wink out and her powwow shut off and leave the river still again; and by and by her waves would get to us, a long time after she was gone, and joggle the raft a bit, and after that you wouldn't hear nothing for you couldn't tell how long, except maybe frogs or something.

每天晚上，我们总有一两回看到一只轮船轻手轻脚在暗地里溜过去，从烟囱里喷出一大簇火花来，象雨点般地落在水面上，煞是好看。然后它拐过一个弯，灯不亮了，吵闹声停下来了，留下的是一片寂静的大河。轮船卷起的水浪，在它开走以后好久才流到我们的面前，把木筏轻轻摇动几下。在这以后，你耳朵里一片寂然，有好长好长一段时间里一片寂然，只是偶然传来青蛙的叫声。

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