所有板块都在缓慢移动，因为它们漂浮在密度更大的半液态地幔上，也就是地壳和地核之间的那一层。
All are slowly moving because the plates float on a denser semi-liquid mantle, the layer between the crust and Earth's core.
所有板块都在缓慢移动，因为它们漂浮在密度更大的半流体地幔上，也就是地壳和地核之间的那一层。
All are slowly moving because the plates float on a denser sem-iliquid mantle, the layer between the crust and Earth's core.
土星的密度是如此之低，以至于如果你能把放在一个巨大的装有水的玻璃杯里，它会漂浮在水面上。
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
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