These steel ball bearings have a density of about 7,800 kilograms per cubic meter.

这些钢珠的密度是，每立方米7800千克。

youdao

During one dust storm, airborne aluminum concentrations exceeded 1,400 micrograms per cubic meter.

一场沙尘暴中，空气中的铝浓度会超过1400微克每立方米。

youdao

During one dust storm, airborne aluminum concentrations exceeded 1, 400 micrograms per cubic meter.

一场沙尘暴中，空气中的铝浓度会超过1400微克每立方米。

youdao

The World Health Organization considers the safe daily level to be 25 micrograms per cubic meter.

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And from this year, new facilities are to meet the tougher international standard of 0.1 nanograms per cubic meter.

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It spews 500 nanograms of dioxin per cubic meter of fume, more than six times the Japanese safe level of 80 nanograms.

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