Fortunately, however, ancient men made tools of stone, especially flint,

然而， 幸运的是，远古人用石头制作了工具，特别是用燧石，

We endeavour to avoid the old, romantic idea of a gusher, which wastes oil and gas.

我们尽量避免使用陈旧天真的喷井方法，那样会浪费石油和天然气。

Many people in industry and the Services, who have practical experience of noise,regard any investigation of this question as a waste of time;

在工业部门工作和在军队中服役的许多人对噪音有切身的体会，他们认为对这个问题进行调查是浪费时间，

and that is what all patients demand of their doctors----to be cured at no inconvenience to themselves.

病要治好，但不要太麻烦。

Before very long the parents will be complaining that the child is so secretive and never tells them anything,

不要很久，家长就会抱怨孩子守口如瓶，什么事也不告诉他们，

which we may call respectively the tough and the gentle.

我们分别称之为强硬法和温柔法。