math weight
计算重量
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Of course, the ones that have nicotine have a tobacco derived substance, so you could probably do some fancy math and figure out a tobacco weight equivalent.
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Nonlinear math equations and systems have been used to explain weight loss, the spread of happiness, strength of metals and hurricanes.
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