两秒钟,三秒钟,四秒钟
在那次武器评估演习中，这名飞行员扮演敌方侦察兵的角色，受到最大功率灼伤，持续时间四秒钟。
He was playing the role of an enemy scout during an exercise that was meant to evaluate the weapon, and got blasted at full power for four seconds.
有十亿多的人口喝不到干净的水，有上亿人口长期处于饥饿状态，每四秒钟就有一个五岁以下儿童死于极度贫困。
More than a billion don't have clean water to drink, while hundreds of millions are chronically hungry. And every four seconds a child under age 5 dies because of extreme poverty.
有十亿多的人口喝不到干净的水，有上亿人口长期处于饥饿状态，每四秒钟就有一个五岁以下儿童死于极度贫困。
More than a billion don't have clean water to drink, while hundreds of millions are chronically hungry. And every four seconds a child under age 5 dies because of extreme poverty.
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