开发这一座山不好，一方面太多的游客会导致环境污染，另一方面山上的动物也会因此没有生存的空间。
Opening up the mountain is not good, on the one hand, too many tourists may lead to environmental pollution; on the other hand, animals will have no room to live.
一方面，参加课外活动可以让学生发展自己的兴趣，而另一方面，太多的课外活动可能会增加学生的负担。
On the one hand, participating in extra-curricular activities allows children to develop their hobbies while on the other hand, too many such activities can increase children's burden.
另一方面，不要在此方面浪费太多时间。
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