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。
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。
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。
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