willing to help but unable to do so;be glad to, but powerless to render assistance;be sympathetic but have no ability [unable] to help;be unable to help sb. even for the sake of love;The spirit is willing but the body weak ;

Doctor: I can do nothing about your condition. I'm afraid it's hereditary.
医生: 你的情况我爱莫能助. 这应该是遗传所致.
来源:互联网摘选Paul: I can't. When it comes to calculus, it's all Greek to me.
保罗: 我爱莫能助呀! 说到微积分, 我可是一窍不通.
来源:互联网摘选
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