Chemists who design drugs keep on trying to make the key fit only one lock.

设计药物的化学家就必须不停地确保这些钥匙只能开一把锁。

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Success is for those who try and keep on trying.

成功是属于那些不断尝试且坚持尝试的人。

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Success is for those who try and keep on trying.

成功是属于那些不断尝试且坚持尝试的人。

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