By comparison the density of silica aerogels - the world's lightest solid materials - is only as low as 1.0mg per cubic cm.
相比之下，世界上最轻的固体材料——硅土气凝胶的密度最小也要每立方厘米1.0毫克。
The dimension of the cases are 17cm high, 30 cm wide and 50 cm long with a volume of about 0.026 cubic meter. The gross weight is 23.5kg.
纸盒的尺寸为高17cm，宽30 cm，长50 cm，体积为0.026 m3，毛重为23.5kg。
The dimension of the cases are 17cm high, 30 cm wide and 50 cm long with a volume of about 0.026 cubic meter. The gross weight is 23.5kg.
纸盒的尺寸为高17cm，宽30 cm，长50 cm，体积为0.026 m3，毛重为23.5kg。
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