作业5

1.直到引入（introduce）了一种完全不同的概念这个问题才得到了解决。

The problem was not to be solved until a completely new method was introduced.

2.在过了将近100年之后才由实验证实了（confirm）亚原子微粒（subatomic particle）的存在。

Nearly 100 years passed before the existence [presence] of subatomic particles was confirmed by experiment。

3.这是由于在导体中有许多自由电子而引起的。

This is due to the fact that there are many free electrons in conductors.

4.一切物质（matter）均是由微粒构成的，这现在是一个众所周知的事实了。

??? that all matter consists of tiny particles.

5.这一章所讲的内容非常重要。

??? is of great importance.

6.物质经过了化学变化后，变成了与原来不同的某种东西了。

After a chemical change, a substance is changed to something different from what it was.

7.一切物质就是零下（below zero）273oC这一温度。画线部分用“what”从句来表示

??? absolute zero is the temperature 273C below zero.

8.小型计算机的应用场合（places）似乎是无止境的（endless）

The places where small computers can be used seem (to be) endless.

9.我们能够找出几个条件来，其中只有两个是必要的。

We can find a few conditions, only two of which are necessary.

10.其每一点的y坐标（y-coordinate）均为零的曲线（curve）就是x轴（x-axis）。

The curve the y-coordinate of each point on which is zero is just the x-axis.