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Transparent hole series shall be set on tank roof for airing and lighting.
透光孔装于油罐顶部，供罐内通风和采光用。
youdao
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Volume of water can be seen through the transparent water tank.
可直接看到水量多少，方便操作。
youdao
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Volume of water can be seen through the transparent water tank.
可直接看到水量多少，方便操作。
youdao