在于

Traditional form:

在於

Pinyin (reading):

zàiyú

Definitions:

• to rest with; to lie in; to be due to (a certain attribute)
• (of a matter) to be determined by; to be up to (sb)

Characters:

• 在 - at, in, on; to exist; used to indicate the present progressive tense
• 于 - at, in, on; to, from; alas!

Traditional characters:

• 在 - at, in, on; to exist; used to indicate the present progressive tense
• 於 - at, in, on; to, from; alas!