在于

zàiyú

HSK 5

在于 — zàiyú

1. to lie in; to rest with; to be due to (a certain attribute); (of a matter) to be determined by; to be up to (someone)

   问题在于方法不对。 wèntí zàiyú fāngfǎ búduì — The problem lies in the fact that the method is wrong.