| 1. | To ask this at any time would be costly and uneconomic .
如果在其它时间来查询，就得花许多钱，很不经济。 |
| 2. | What happens if in the previous example we allow reflections ?
如果在前面的例子中，我们允许翻转，会发生什么情况呢？ |
| 3. | If ammonia were introduced into such a system, it would not be stable .
如果在这类体系中加入氨，则体系会变得不稳定。 |
| 4. | "i'll go quietly if there's no stigma on my record," he told me .
“如果在我的履历上不留下任何污点的话，我会不声不响地离开。”他告诉我。 |
| 5. | If we were to put a force on the particle, then it would react against the force .
如果在这个粒子上施加一个力，那么它就会反作用于这个力。 |
| 6. | If a vibrating string is lightly touched at its midpoint, its pitch goes up an octave .
如果在一根振动弦的中部轻轻一触，它就发出高八度的音。 |
| 7. | If the compliances are not equal in the three orthogonal directions, it is anisoelastic .
如果在三个垂直方向的弹性变形率并不相等，即它是不等弹性的。 |
| 8. | The composition of the fallout can also be changed by "salting" the weapon to be detonated .
如果在起爆武器中另“加了料”，那么沉降物的成分也就会有所改变。 |
| 9. | Two graphs are isomorphic if there is a correspondence between their vertex sets that preserves adjacency .
如果在两个图之间存在一个保持邻接性的1-1对应，则这两个图是同构的。 |
| 10. | Thus setting up a single sample plot in an area can produce some rather bewildering result .
因此，如果在某个地区内只在某单块抽样小区内采样，那末就可能得到某种较为含糊的结果。 |
