讲解文本：

play favorites 偏心，偏爱
Teachers are not supposed to play favorites. That's unfair to other students.
老师不应该有偏心，这样对其他学生不公平。
It's ok to have a good friend in the office, but don't play favorites.
在办公室有一个朋友是好事，但也不要太偏心了。

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