Don't stay talking to one person all evening - circulateamong your guests.
不要整晚上和一个人谈话——在客人中多转转。
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The readers are protected by a lock, but the lock is a standard one, and keys can be bought on the Internet: besides, the keys circulateamong election officials.
Swine influenza viruses may circulateamong swine throughout the year, but most outbreaks occur during the late fall and winter months similar to outbreaks in humans.