Water__(contain)oxygen and hydrogen.

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Water__(contain)oxygenandhydrogen.Water__(contain)oxygenandhydrogen.Water__(contain)oxygenandhydroge

Water__(contain)oxygen and hydrogen.
Water__(contain)oxygen and hydrogen.

Water__(contain)oxygen and hydrogen.
填contains.water是不可数名词,而水含氧和氢分子又是永恒不变的真理.所以这里用一般现在时的第三人称单数.

contains

contains
水包含氧和氢