The contract includes modifications, development, repairs, and limited, critical, or contingency spares for all Air Force-managed weapons systems.

该合同包括为空军武器管理系统修改、开发、修理和限定关键的或偶尔用到的备用件。

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But air quality remains such a large problem that officials are also preparing contingency plans that could force factories across much of northern China to close temporarily if conditions warrant.

然而，空气质量依然是一个大问题，因此官方还制定了一项预案，在必要时，强行临时关闭华北大部分地区的工厂。

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But air quality remains such a large problem that officials are also preparing contingency plans that could force factories across much of northern China to close temporarily if conditions warrant.

然而，空气质量依然是一个大问题，因此官方还制定了一项预案，在必要时，强行临时关闭华北大部分地区的工厂。

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