庭院，院子部分或完全地被墙或建筑物封闭的露天空地；庭院。
An extent of open ground partially or completely enclosed by walls or buildings; a courtyard.
我们必须想象早期的地球是岩石材料、金属和封闭气的混合物，受到较小的星子的持续轰击，没有多少大气。
We must imagine the early Earth as a mixture of rocky materials, metals, and trapped gases, subject to constant bombardment by smaller planetesimals and without much of an atmosphere.
如果没有封闭它，那么就可以尝试在这里画某类环状物。
Well, if you don't quite close it all the way around, so I can try to, indeed, draw some sort of doughnut here.
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