The composition of water requires oxygen and hydrogen.

水的组成需要氧和氢。

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Scientists already knew how the composition of water varies throughout the country.

科学家已经知道全国各地水的成份变化情况。

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It is a prerequisite and basis to set up a water rights transfer system to define clearly the composition of water rights transfer entities.

在水权转让中，当事者具有十分重要的地位，明晰水权转让当事者的构成是建立水权转让制度的前提和基础。

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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

On average, the composition of Holstein milk is 87.7 percent water, 3.7 percent milk fat and 8.6 percent skim solids.

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Indeed, a calculation Dr Ip performed, based on the volume and composition of the urine he collected in the plastic buckets, and of the head-dunking water at the end of each day, suggested that only 6% of the urea excreted by the turtles was leaving them in the traditional manner, via urine.

ECONOMIST: Softshell turtles urinate through their mouths