口数，人数、指口数粥。
日本是独一人口数下降的国家吗？
最简单的真数是自然数，即平时我们口数的一、二、三三…。
Thee simplest real numbers are the natural numbers, which are just the ordinary counting number l, 2,3…
采用相关分析和通径分析法探讨了烟支重量、吸阻和抽吸口数等指标对T PM的影响。
The effects of cigarette weight, draw resistance and puff number on TPM were studied with correlation and path analyses.
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