To keep healthy, there are at least three things we can do every day.23. 那就是(说)...;亦即…That is to say, .= That is, .=Namely, ...例：我们生活需有规律。也就是说，早睡早...
Nowadays it is more difficult for children to concentrate or pay attention in school.What could be the possible reasons for this?Which are the solutions you can propose? 现在的孩子在学校里很难集中注意力?可能造成这一现象的原因有哪些?你可以提出什么样...
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