Customers - some dressed in work clothes, some in expensive suits and overcoats - circulate among the counters and stare at shelf after shelf of roses in more than 50 colors.
顾客们有的身着工装，有的身着昂贵的西服和外套，他们在店内的柜台间走动，一架一架地浏览50多种颜色的玫瑰。
Don't stay talking to one person all evening - circulate among your guests.
不要整晚上和一个人谈话——在客人中多转转。
Swine influenza viruses may circulate among swine throughout the year, but most outbreaks occur during the late fall and winter months similar to outbreaks in humans.
猪流感病毒在全年都有可能传播，但大部分会在深秋和冬季月份爆发，这一点与人流感类似。
Swine influenza viruses may circulate among swine throughout the year, but most outbreaks occur during the late fall and winter months similar to outbreaks in humans.
猪流感病毒在全年都有可能传播，但大部分会在深秋和冬季月份爆发，这一点与人流感类似。
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