On the one hand they'd love to have kids, but on the other, they don't want to give up their freedom.

一方面，他们想要孩子，但另一方面，他们又不想放弃自由自在的生活。

On the one hand, if the body doesn't have enough cholesterol, we would not be able to survive. On the other hand, if the body has too much cholesterol, the excess begins to line the arteries.

一方面，如果身体没有足够的胆固醇，我们将无法生存；另一方面，如果体内胆固醇过多，多余的胆固醇就开始让动脉变厚。

On the one hand I admire his gifts, but on the other I distrust his judgment.

一方面我羡慕他的才华，而另一方面我却怀疑他的判断力。

On the one hand, it does not increase taxes for millionaires; on the other hand, drive children out of preschool. That's too ridiculous.

一方面，不给百万富翁增税；另一方面，把孩子们赶出学前班。那未免太荒唐了。

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.

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。