为什么这里要用by doing?在这里,How would you account for the fact that explorers used to be willing to take great risks,by sailing across the sea without navigational instruments?by sailing.在这里的用法我不是很理解.

问题描述:

为什么这里要用by doing?在这里,
How would you account for the fact that explorers used to be willing to take great risks,by sailing across the sea without navigational instruments?
by sailing.在这里的用法我不是很理解.

by doing sth. 靠/通过做……
如:The old lady made a living by selling eggs. 老妇人靠卖鸡蛋为生。
此句译为:你如何解释这一事实:探险者过去愿意冒险,远航可以不用导航仪器?

by 作介词
介词后面要加动词的ing形式

因为by是介词,介词后要跟名词,而sail是动词,所以要写出动名词形式,by +n./v.ing表示通过...的方式

因为他是现在进行时,be动词要加doing

意思就是说用驾驶帆船的方式,
这种用法就好像说开车去哪里用,go somewhere by driving
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by应该有通过的意思

by 作介词
介词后面要加名词,所以就要用动词的ing形式 (动名词形式)
即by+V.ing/n
sail是动词,所以变成:by sailing
明白了吗?^_^