I only do so when there's been a screwup.

If I'm a screwup, what are you doing with me?

如果我不行，你会对我怎样？

Heat the metal ring only . Can the metal ball go through the ring? Why?

单独加热金属杯, 铁球能穿过金属环 吗 ?为什么?

He made the rope fast to the metal ring.

他把这根绳子紧系在金属圈上.

To remove the metal ring and replace the golden ring.

从十字挂图主体取出金属圈,并置回金色金属圈.

He made fast the rope to the metal ring.

他把绳子紧紧地绑在那金属圈上.

He made the wire fast to the metal ring.

他把这根铁丝紧系在金属圈上.

Roger made the rope fast to the metal ring.

罗杰把绳子牢牢地拴在金属环上.

Choose between virtually any standard cam motion with a couple mouse clicks.

几乎所有的标准之间的凸轮运动选择一对夫妇鼠标点击.

Select a vertex, point or other system as origin.

选择三个面,它们相交的点作为坐标点.

Our teacher have a bee in his bonnet about punctuation.

我们的老师没完没了地琢磨著标点符号.

When the ancient prose is punctuated, the meaning becomes clear.

这篇古文加上标点符号, 意思就清楚了.

Still others describe the sequence as a book full of letters with no words or punctuation.

还有另外一些人把这些序列描绘成一部不分单词也无标点符号的满篇字母的书.

Punctuation, then, is a matter of care.

由此说来, 标点符号又是个要谨慎从事的问题.

But if salt loses its saltiness , there is no way to make It'salty again.

可是盐若失去了咸味,便无法恢复原味.

Self-parody and saltiness riddled their core genre.

自我 嘲笑和直斥现实充斥了他们的核心文艺形式.

The radial distributions of the mean and fluctuating velocities of the air flow and drops, the drop size and the concentration were measured at several axial stations with2D PDA.

实验用二维激光测速测粒仪对喷嘴下游几个截面上气流和液滴的平均速度和脉动速度，以及液滴的粒度和浓度沿径向的分布进行了测量。

Once you open the door, and all the cold air drops out, when you close it again, the fan directs more cold air into the cabinet lot quicker than it does on the other types of designs.

一旦你打开冰箱门，所有的冷空气都会被放出，当你再次关闭的时候，风扇把更多的冷空气引入冷气室，其制冷速度要比其它类型的设计更迅速。

The local density of states takes much larger values in the air cylinders areas and drops down at the boundary between the air cylinders and dielectric medium background, and this phenomenon is due to the continuity of electric displacement vector.

第二，局域态密度在空气散射子界面处发生突变，空气散射子区域的局域态密度相对较大，这可由电位移矢量的连续性来理解。

Experimental studies have been performed on the board of Russian IL 76 reduced gravity airplane for two phase air water pressure drops in a square cross section channel.

利用俄罗斯IL76失重飞机对微重力条件下方形截面管道内的水/气两相流压降进行了实验研究。

There were basically no green areas in cities, so the air quality drops because there is no natural regeneration of the air.

在城市中几乎没有绿色植物，因此没有自然的空气代谢的时候，城市的空气质量就下降了。