物理学专业英语 仲海洋版9.2节(9)

is not clear to anyone. 这件事怎样发生的，谁也不清楚。
?Where Coulomb confirmed the inverse-square law for the electrostatic force? remains to be proved. 库仑到底是在哪里确定静电力的平方反比定律还有待证实。
5) 关系代词what引导
?What we need? is a precision tool. 我们需要的是精密工具。
?What the physicists were waiting for at that time? was a solar eclipse. 那时，物理学家们等待的就是一次日食。
?What make the lab more impressive? are the modern instruments. 为实验室增色的是现代化的仪器设备。
10.1.2 主语从句与形式主语it
有时为了考虑句子平衡，通常在主语从句的位置使用形式主语it，而将真正的主语从句移至句末。用 it 作形式主语的 that 从句有以下四种不同的搭配关系:
"It+be+形容词+that 从句”，如:
It is necessary that ... 有必要……
It is natural that... 很自然……
It is strange that... 奇怪的是……
"It+be+过去分词+that从句”，如:
It is known to all that ... 众所周知……
It is reported that... 据报道……
It is said that... 据说……
It has been proved that... 已证实……
"It+be+名词+that 从句”，如:
It is a fact that ... 事实是……
It is an honor that... 非常荣幸……
It is common knowledge that... ……是常识
"It+不及物动词+that 从句”，如:
It appears that ... 似乎……
It seems that... 似乎……
It happened that... 碰巧……
It occurs that... 碰巧……
用it作形式主语时分以下三种情况：
1) 对于以连词that引导的主语从句，通常用形式主语代替主语从句:
For example, in electric circuits it is often assumed ?that the relations between voltages and currents are linear?. 例如，在电路中通常假设电压和电流的关系是线性的。
It has been found repeatedly in science ?that the discovery that two branches are related leads to each branch helping in the development of the other?. 在科学中经常发现，与两个分支相关的发现会导致两方相互促进发展。
It is quite clear ?that the whole project is doomed to failure?. 很清楚，整个计划注定要失败。
It's a pity ?that he didn't find any useful results in the experiment?. 很遗憾他在实验中没找到什么有用的结果。
It is important that ?the experiment should be carried o
ut in vacuum.? 实验必须在真空内进行。
2) 对于以连接代词（副词）引导的主语从句，可以使用形式主语代替主语从句，也可直接在句首使用主语从句:
?Whether they would support us? was a problem. 他们是否会支持我们还是一个

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