Check At Each Level(层层把关), 此释义来源于网络辞典。
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According to theory, lead-acid batteries need to check the density of the electrolyte and the height of the liquid level at each time of maintenance, if there is a lack of need to add distilled water.
按照理论上说，铅酸蓄电池需要在每次保养时检查电解液的密度和液面高度，如果有缺少需添加蒸馏水。
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