他们向观众挥手致意并走向后台。
人们拥向后台想看一眼他们崇拜的歌星。
People crowded behind the scenes to have a look at their admired singer.
当试图向后台系统提供测试数据以支持可能发生的错误场景时，通常会遇到挑战。
It is also common to find challenges when attempting to provision test data in back-end systems to support all possible error scenarios.
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