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.

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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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本文一共由五部分构成：第一部分是关于公司转投资限制的必要性分析。

The dissertation contains four parts:The first part is on the company to the investment restrictions of the need for analysis.

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无论是关于衰变的必要性，和龋齿，和痛苦的真实，大多数父母已经使管理，他们的祖先在他们之前，这种痛苦会来自己的孩子。

Whatever may be true in regard to the necessity of decay, and caries, and pain, most parents have already so managed, and their ancestors before them, that suffering will come to their children.

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无论是关于衰变的必要性，和龋齿，和痛苦的真实，大多数父母已经使管理，他们的祖先在他们之前，这种痛苦会来自己的孩子。

Whatever may be true in regard to the necessity of decay, and caries, and pain, most parents have already so managed, and their ancestors before them, that suffering will come to their children.

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