In some ways, negative feedback is more valuable to a teacher than positive comments.
在某种程度上，负面的反馈比正面的评价对老师更有价值。
The teacher often comments on how different the two boys are.
老师经常谈论那两个孩子的不同之处。
The teacher often comments on [upon] how different the two boys are.
老师经常谈论那两个孩子的不同之处。
The teacher made comments on our compositions.
老师就我们的作文作了讲评。
The teacher made comments on our compositions.
老师就我们的作文作了讲评。
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