彗星气状星体中松动的冰块也许比固态的小行星还要可怕，况且科学家们还不清楚如何去对付那些更不稳定的“亲戚们”。
The loose chunks of ice debris within a comet's gaseous body might also prove more of a nightmare than solid asteroids, and scientists still don't know exactly how to deal with the rockier Cousins.
钠蒙脱石能被冷冻干燥成气凝胶——类似海绵状的物质。
Sodium montmorillonite can be freeze-dried into a spongelike material known as an aerogel. Aerogels are famously fragile.
在水生植物中，是没有栅状叶肉细胞的，所以有很多胞间隙(气室)以增加浮力。
In aquatic plants, the palisade cells are absent so that there is more intercellular Spaces (air Spaces) for buoyancy.
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