在于 Traditional (Taiwan): 在於 On the HSK 4 vocabulary list, at CEFR level B2. zàiyú ㄗㄞˋ ㄩˊ to rest with to lie in to be due to (a certain attribute) to be determined by to be up to (sb) of a matter Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT