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》

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》

youdao

A doctor examined Brown. He reported that Brown's wounds were not serious enough to prevent the trial from starting.

VOA: special.2009.07.02

The patriarchal stories are clearly not the work of the Deuteronomist, and these stories must have had very longstanding traditional authority if they were adopted without serious modification by the Deuteronomist redactor some modification, but not serious.

那些宗法故事显然不是预言师的作品，这些故事必然经过了传统权威的检验,如果他们是未经更改直接引用的话,由那些预言编写者,这里有一些改动，但不是太多。

耶鲁公开课 - 旧约导论课程节选

Since they do not think about the things that are serious, they get excited by tiny things."

尽管他们不会考虑国家大事,但零星琐事都却能令他们激动万分

耶鲁公开课 - 1871年后的法国课程节选

"America is not serious about discussing this type of chemical weapons use, " al-Zoubi said.

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Eight were receiving hospital treatment, but the injuries were not serious, the ambulance service said.

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With that said, what you wrote are not serious policy suggestion but bumper sticker slogans.

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