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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（）
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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。
翻译句子：It is essentially the“giantness”of the size of the polymer molecule that makes its behavior different from that of a commonly known chemical compound such as benzene.
马斯洛在1970年提出需要层次理论，包括生理需要、以及（ ）
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