为什么这里要用by doing?在这里,
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.
答
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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