以上来源于: WordNet
Its regular phases make the moon a very convenient timepiece, and the periods of its waxing and waning form the basis of many of the oldest calendars.
其规律性的月相使之成为一种非常方便的计时器，很多古老日历的发明都源自对月圆月缺变化的观察。
The moon's low gravity also means that water composed of regular hydrogen and oxygen will escape quicker than heavy water, perhaps leading to a concentration of deuterium in the water of the moon.
月球的低重力也意味着由普通氢气和氧气组成水将会比重水更快的消失，可能导致在月球上水的氘含量。
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