As it happens, a razor that is safe in Europe is unlikely to electrocute Americans.

碰巧在欧洲使用安全的剃须刀不大可能使美国人触电身亡，

Silicon Valley may prove a classroom for building a global business.

它很可能成为建立全球商业的一个教学场地。

and these will ply the short wings with such irresistible power that they can bore for long distances through an opposing gale before exhaustion follows.

这些肌肉以巨大的力量扇动短小的翅膀，使这类鸟能顶着大风飞行很远的路才会疲劳。

But having satisfied the requirements of practical necessity, most people go no further.

但是，大部分人在满足了实际需要后，就不再继续发展这种能力了。

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，

gravity is the force that drives them in a continual attempt to restore the ocean surface to a flat plain.

地球引力是持续不断企图使海面复原为平面的力量。