模态逻辑是关于必要性和可能性的逻辑。

Modal logic is the logic of necessity and possibility.

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相反，他要说的是关于能源使用和平等以及在讨论气候变化时把以上两点也考虑进去的必要性。

Instead, it's about energy use and equity - and the need to keep those issues in mind when discussing climate change.

youdao

锤击试验另一个比较重要的测试注意事项是关于预触发延迟必要性的。

Another somewhat important test consideration for impact testing relates to the need for pretrigger delay.

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