气体的密度低到足以形成对流。
The density of the gases are low enough to allow convective currents to develop.
气体的密度比固体和液体要小得多。
The gas is much less dense than either the solid or the liquid .
利用雷达也许还能探测出气体的密度。
You make the volume infinitely large, the density of the gas infinitely small.
密度无限小,气体分子之间的相互作用。
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