(after a noun) between; among; amid / (used after certain bisyllabic words to form expressions indicating a short period of time, e.g. 彈指之間|弹指之间[tan2 zhi3 zhi1 jian1])
(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 ...)"