Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18.
水中几乎所有的氧都是氧16,但每一千个分子中就有几个含有较重的同位素18。
Mister Wegener said the lighter continental rock floated up through the heavier basalt rock of the ocean floor.
VOA: special.2010.01.12
So here is a list of size 2, this is the light one, this is the heavier one.
这是有2个元素的一个序列,这杯轻一些,这杯重一些。
The heavier a person is the more likely they are to die of cardiovascular disease.
人越胖,死于心血管疾病的风险越高
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