Mrs. Yang is our supply teacher today because our English teacher caught a cold last night.
我们英语老师昨晚感冒了，杨老师今天来代课。
The quantity and the quality of teachers are two important dimensions of teacher supply.
教师队伍的规模与质量是师资供给的两个重要方面。
The quantity and the quality of teachers are two important dimensions of teacher supply.
教师队伍的规模与质量是师资供给的两个重要方面。
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