它们的几乎全部质量都由氢和氦贡献，这使得它们的组成成分与太阳类似。
Nearly all their mass is made up of hydrogen and helium, giving them compositions like that of the sun.
研究人员希望能找到一个类似的基于生物的系统来执行该进程的另一半，氢的生产。
The researchers hope to find a similar biologically based system to perform the other half of the process, the production of hydrogen.
氢是宇宙中分布最为广泛的元素，它是类似于木星和土星这样的巨行星主要的构成成分。
Hydrogen is the most abundant element in the universe and is a major component of giant planets such as Jupiter and Saturn.
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