题目内容
粘稠性，稠度
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macromolecule
高聚物
To contrast the difference, the molecular weight of common salt is only 58.5, while that of a polymer can be as high as several hundred thousand, even more than thousand thousands.其中 that 指代（）
As an example, a gaseous compound called butadiene, with a molecular weight of 54, combines nearly 4000 times and gives a polymer known as polybutadiene (a synthetic rubber) with about 200 000molecular weight.poly 表示 many。所以polybutadiene 是高分子化合物。
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