长时间浸泡而成褐色的叶子浮上了水面，又消失在了水的深处。
Leaves, brown with long immersion, rose to the surface and vanished back into the depths.
在陆地上，水的浮力支持消失了，植物不再浸泡在营养液中，空气会使植物变干。
On land, the supportive buoyancy of water is missing, the plant is no longer bathed in a nutrient solution, and air tends to dry things out.
石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。
Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
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