A: I have to an operation, a valve in my heart is broken.
B: That sounds serious.
valve
n. 1。阀，活门；2。（心脏的）瓣膜，（管乐器的）活瓣
A: You have been looking into that mirror for half an hour.
B: I am just practicing my vanity.
vanity
n. 1。自负，自大，虚荣；
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