The statistic model of fire risk assessment is based on fire losses, population density, buildings density, road density and fire protection force.

选用单位面积火灾损失、人口密度、建筑密度、路网密度和消防力量建立城市火灾危险预测与评估的统计模型。

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On December 26, China passed the Yangtze River Protection Law, which came into force on March 1, 2021.

12月26日，中国通过了《长江保护法》，于2021年3月1日生效。

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Frances Perkins the first woman cabinet member who advocated the 8 hour day, stricter factory safety laws, and laws for the protection of women and children in the labor force.

弗朗西丝·帕金斯：第一位女性内阁成员。她提倡8小时工作制、更严格的工厂安全法规以及保护妇女和儿童劳动力的法规。

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Later it was revealed that Mladic had been able to press on unhindered by issuing ultimatums to the U.N. protection force.

CNN: Srebrenica: Worst European atrocity since WWII

SARAJEVO, Bosnia-Herzegovina (CNN) -- For the last time, spokesmen for the United Nations Protection Force for Bosnia-Herzegovina gave a press briefing Tuesday.

CNN: U.N. makes way for NATO - Dec. 19

The settlement also agreed to integration of thousands of rebel fighters into the Sudanese army, as well as a protection force for civilians.

NPR: Darfur Rebels Sign Pact with Sudanese Government