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1·Happily, his neck injuries were not serious.

幸运的是，他脖子上的伤并不严重。《柯林斯英汉双解大词典》

2·The problems are not serious. Nonetheless, we shall need to tackle them soon.

问题不严重，不过我们还是需要尽快处理。《牛津词典》

3·Most of them are not serious; fainting and dizziness are the most frequent complaints.

大多数症状都不严重，人们抱怨的最多的症状是昏厥和头晕。

4·The patient's disease was not serious enough.

病人的病不够严重。

5·You're not serious, are you?

你不是认真的吧？

6·We were greatly relieved to learn that his condition was not serious.

听说他的病情并不严重， 我们的心就宽多了。《新英汉大辞典》

7·They are not serious enough at that age.

那个年龄的他们不够稳重。

8·That's not serious!

那也不重要。

9·That is not to say the charges are not serious.

这并不意味着罪行指控不严重。

10·They have all the weapons in the world but they're not serious.

他们拥有世界上所有武器，可是他们偏不认真去打。