The supply teacher question is an unsolved problem.
代课教师问题是老问题.
These supply teacher takes dozens of Yuan to several hundred Yuan different wages every month.
这些代课教师每月拿数十元到数百元不等的工资.
Teacher: So as a star ages, it begins to using up the supply of hydrogen and it's swell begins turning red.
老师:随着恒星的年龄增加,其氢也逐渐用完,收缩变红。
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