用心

1. diligently; attentively; with concentrated attention

♦ ~学习 concentrate on one's studies; study diligently

♦ ~听讲 listen attentively to a lecture

♦ ~思索 think hard

2. motive; intention

♦ ~险恶 have vicious intentions; harbour sinister motives

~良苦 have really given much thought to the matter; have expended much care and thought on sth.