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1·It is natural that parents should wonder about the time children spend looking at a TV or computer screen.

父母很自然地会想知道孩子花在看电视或电脑屏幕上的时间。

2·It is natural that he thought so.

他那样想是自然的。

3·It is natural that he should fail.

他失败是很自然的。

4·It is natural that she should cry.

她哭是人之常情。

5·It is natural that she (should) do so.

很自然她应该这样做。

6·It is natural that he should think so.

他这样想是很自然的。

7·It is natural that children love their parents.

很自然孩子们喜欢自己的父母。

8·It is natural that boys and girls become friends.

男孩子跟女孩子交朋友是件很自然的事。

9·It is natural that a bird ( should ) rest in trees.

鸟在树上安歇是很自然的。

10·It is natural that they should have different views.

他们有不同观点是很自然的。