The chemical composition of water is H2O whether it is solid, liquid, or water vapor.

不管水是固、液或气态，它的化学组成都是H2O。

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The chemical composition of water remains constant whether it is in solid, liquid or gaseous state.

无论处于固态、液态或气态，水的化学成份都保持不变。

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The reserve tanks at a reactor contain the same grade of water in terms of purity and chemical composition that are normally used in the core.

反应堆的储备箱里储备了与反应堆内同等纯度和化学构成的水。

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In addition to a sea floor mapping project, the researchers will make chemical analyses of water samples that will help them determine the temperature, salinity and composition of a strong circumpolar current that flows around the boundary of the Arctic Ocean.

CNN: Nuclear sub dives under the ice to explore climate change