The humus, which is made of lighter things, like crumpled leaves, floats on top.
腐殖质是由较轻的东西（如皱烂的叶）构成的，于是漂浮在表面。
If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders.
如果针浮在水面而不是下沉，这就证明该女孩是一个熟练的刺绣者。
The oil floats on top of the jar and seals out air, leaving water to collect at the bottom, where it ACTS like a Petri dish for botulism.
油浮到罐头的顶部，封住空气，留下水在底部聚集，就像是为肉毒菌提供一个有盖培养皿。
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