她生来就有一个衰弱的心脏。
这种病以一个扩大的、衰弱的心脏为特征，接着影响泵功能，并且常常导致慢性心力衰竭。
This disease is characterized by an enlarged, weakened heart, subsequently affecting the pumping capacity and often leading to chronic heart failure.
他看上去强健，其实他的心脏很衰弱。
He appears to be strong and healthy, but, as a matter of fact, he suffers from a very weak heart.
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