之所以 zhī suǒ yǐ

DEFINITIONS

  1. the reason why

CHARACTERS

之 zhī
HSK 4
marks preceding phrase as modifier of following phrase; it, him her, them; go to
所 suǒ
HSK 2
place, location; numerary adjunct
以 yǐ
HSK 2
by means of; thereby, therefore; consider as; in order to