the density of a gas
一种气体的密度
英语解释：the thickness of a solid, liquid or gas measured by its mass per unit of volume 密度(固体、液体或气体单位体积的质量):
注：一词多义，单词一次只记一种意思即可。
,
the density of a gas
一种气体的密度
英语解释：the thickness of a solid, liquid or gas measured by its mass per unit of volume 密度(固体、液体或气体单位体积的质量):
注：一词多义，单词一次只记一种意思即可。
,
