之所以
word C2- (after a noun N and before a predicate P) the reason why N P
- Example: 我之所以討厭他|我之所以讨厌他[wo3 zhi1 suo3 yi3 tao3 yan4 ta1] "the reason why I dislike him (is ...)"
From the library
顾吾念之，强秦之所以不敢加兵于赵者，徒以吾两人在也。
然则哭泣也者，固人之所以成始成终也。
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