one who sets his mind on doing sth. useful; 有心人
I intended to visit him, but I was afraid I would disturb him. 我有心去看看他,又怕打扰他。
He didn't purposely make things difficult for you. 他可不是有心难为你。
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)