The minimum standard, where fire hoses or overhead sprinklers are not present, is one fully charged fire extinguisher per 1000 sq. ft. of living space.
如果没有灭火水龙带和高空洒水装置，我们的最低标准就是每1000平方英尺的居住面积都应备有一个灭火器。
Neurons fire when electrically charged atoms – ions – flood in and out of them, creating a tiny electric potential across their membranes.
当大量带电原子或离子出入神经元时，会产生微小的跨膜电势，同时神经元放电。
He charged the fire with firewood and coal.
他向火堆里添加木柴和煤。
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