It is present in the Earth's crust at just 0.003 parts per billion and is priced in $ per gram, not per kilogram.
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not per kilogram
不是每公斤
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Um... I gave you the specific heat for water in calories per gram, not per kilogram.
嗯，我给你比热,每克水的比热，不是每千克。
youdao
Liquid milk and other dairy products can not go above two-point-five milligrams per kilogram.
每公斤液态奶和其他奶制品中的三聚氰胺含量不得超过两点五毫克。
Not much, admittedly, when compared to the 128 watt-hours per kilogram of a lithium-ion battery, like that found in many electric cars.
ECONOMIST: Carbon-composite batteries
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