Like a rainbow, its daylight equivalent, a moonbow is produced when light is broken up into its constituent colours as it passes through water droplets.

月虹与白天出现的彩虹一样，是光通过水滴分解成多种色光后产生的，而光本身是由多种色光组成的。

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He saw that the constituent parts were being separated, with hydrogen gas falling into the star while water vapour remained farther out and the dust was farther out still.

他发现组成部分正在分离——氢气落入恒星里面，而水蒸汽留在外围，尘埃还在更外面。

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Water vapor is a normal constituent of the atmosphere.

水蒸气是大气的正常组成部分。

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They allege that the company's drilling polluted their water with chemicals,metals and methane, the main constituent of natural gas, causing explosions as well as gastrointestinal and neurological illness.

VOA: standard.2010.01.02

Oxygen, water's other chemical constituent, is common in rocks.

ECONOMIST: Mars Odyssey

With that stroke of his pen, Governor Perry made Texas the first state in the country to require by statute the well-by-well public disclosure of all the constituent chemicals, compounds and water volume contained in frac fluids.

FORBES: Why the Texas Disclosure Law Really Does Work