tpo16阅读第三篇,有个句子不明白,
tpo16阅读第三篇,有个句子不明白,
Other dimensions along which the two groups differ markedly are density and composition.
也是同一篇的,at the low temperatures of the jovian planets even the lightest gases are unlikely to acquire the speed needed to escape.这里的needed为什么是过去式呢?
另外,the slightly larger terrestrial planets Earth,Venus,and Mars retain some heavy gases like carbon dioxide,but even their atmospheres make up only an infinitesimally small portion of their total mass.请问这里的but even能理解成“就算是”吗?