I've listened to it so many times that I know it by heart.
我已经听了这么多次，都把它熟记于心了。
I've listened to it dozens of times.I don't understand it but I know it by heart.
这个讲座我已经听过很多次了。虽然我不明白是什么意思，但是心里却记下了它的内容。
"My black heart," says one black woman as she contemplates marrying out, "I would need to turn it in." "we know it's a struggle," says another, "but we women got to stand by the black man."
一位黑人女性思考过通婚之后说“我有一颗黑人的心，我不会通婚”另一位黑人女性说“我知道这是个很纠结的问题，但是我们黑人女性就要支持黑人男性嫁给他们。”
I'd tell you the end of that story, but I think you know it by heart.
我可以告诉你结局，但我想你应该刻骨铭心地记得。
The students must know that old story by heart, so I would ask some of them to retell it in their own words if I were you.
学生必须记住那个老故事，因此我会请求有些重述它在他们自己的词，如果我是您。
The students must know that old story by heart, so I would ask some of them to retell it in their own words if I were you.
学生必须记住那个老故事，因此我会请求有些重述它在他们自己的词，如果我是您。
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