Customers being added to the queue at random times.
客户在随机时间被添加到队列中。
Good fortune planet Jupiter meets with Venus only once a year at random times.
代表好运的木星与金星每年只在不确定的时间相遇一次。
So you may notice incorrect output at random times perhaps in one run out of a hundred.
所以可能程序运行100次中的随机一次,才能让你意识到有错误。
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