Water is composed of hydrogen and oxygen.
水由氢与氧化合而成。
It is wide known that water is composed of hydrogen and oxygen.
众所周知，水是由氢和氧构成的。
The fact that water is composed of hydrogen and oxygen is undeniable.
合而成这一事实是无可否认的。
Alcohol molecule is composed of carbon, hydrogen and oxygen.
酒精分子由碳，氢，氧三种元素构成。
Alcohol molecule is composed of carbon, hydrogen and oxygen.
酒精分子由碳，氢，氧三种元素构成。
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