switch的确有改变的意味，不过与change不同。看英英释义即可：If you switch to something different, for example to a different system, task, or subject of conversation, you change to it from what you were doing or saying before. 转向··可以看出，这个swich较正式，而且一般是switch sth to sth结构，表示兴趣、模式、话题的转换。 其他有改变这个意思的单词太多了。如：transform,vary,modify
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