sb does his research carefully in various places
深入很多地方调查 - extensive research
A deeper understanding 更深入的了解
XX made an in-depth investigation in various places.
顺手采纳答案深入地去思考 的英语是think deeply例句：因而这部片子的思维对观影者来说成为了现实，更深入地去思考那些从前从不会做过的事。The concept of the movie thus becomes reality to the viewer, a heavy thing to think deeply about and something that hasn't been done before.
sb makes an intensive study of each place
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纵横四海2000
