HSK 6
于
yú介
to go; to take; sentence-final interrogative particle; (of time or place) in; at; on; (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for; (indicating a source) from; out of; surname Yu
解决问题的关键在于沟通。
Jiě jué wèn tí de guān jiàn zài yú gōu tōng.
The key to solving the problem lies in communication.
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New in the HSK 3.0 word list at level 6.