另一种可能是下沉的板块冷却了邻近的地幔，并产生对流，使板块移动。
Another possibility is that the sinking plate cools the neighboring mantle and produces convection currents that move the plates.
我们想办法使船没有下沉。
这并不改变航行器的质量，但是减小了它的体积，这将降低它的浮力并使它慢慢下沉。
This does not change the craft's mass but decreases its volume, which lowers its buoyancy and makes it slowly sink.
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