(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 ...)"
活用
huó yòng
to apply (knowledge etc) creatively and flexibly / to use a word flexibly (e.g. a noun as an adjective)
home / family / (polite) my (sister, uncle etc) / classifier for families or businesses / refers to the philosophical schools of pre-Han China / noun suffix for a specialist in some activity, such as a musician or revolutionary, corresponding to English -ist, -er, -ary or -ian / CL:個|个[ge4]
to hold / to contain / to grasp / to take hold of / handle / particle marking the following noun as a direct object / classifier for objects with handle / classifier for small objects: handful
to compare / (followed by a noun and adjective) more {adj.} than {noun} / ratio / to gesture / (Taiwan pr. [bi4] in some compounds derived from Classical Chinese)