轻: Ⅰ形容词1.(重量小; 比重小) light 短语和例子身轻如燕 light as a swallow; 油比水轻。 oil is lighter than water. 这箱子轻得出人意外。 the suitcase is surprisingly light.2.(数量少; 程度浅) small in number, degree, etc.: 年纪很轻 be very
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Helium is also lighter than air , but it costs a lot of money . so balloons were ( and are ) usually filled with hydrogen 氦也是一种比空气轻的气体，但是它太昂贵，因此气球通常都是装满氢气的。
