例句
Well, we know nitrogen has what?
对于氮气我们知道什么？
The plant requires nitrogen in order to make proteins.
植物需要氮以便制造蛋白质。
All of these from the group one and two through the group five and six elements, but what about elements, what about molecules like hydrogen, or nitrogen, or maybe oxygen?
所有的这些都是来自于第一主族和第二组主族,到第五主族和第六组主族的悬殊，那么元素呢，比如氢气，氮气或氧气那样的分子呢？