Those marshes are "an ideal natural laboratory," Horton said, because they are always slowly sinking and being rebuilt as tides wash in new sediment.
Horton认为那些沼泽简直就是“理想的自然实验室”，因为它们常常发生缓慢沉降，同时随着潮水携带进新的沉积物而被缓慢重构。
The tectonic plates are always slowly moving, but they get stuck at their edges due to friction.
板块一直在缓慢的移动中，但它们的边缘会因为摩擦力而挤在一起。
The tectonic plates are always slowly moving, but they get stuck at their edges due to friction.
板块一直在缓慢的移动中，但它们的边缘会因为摩擦力而挤在一起。
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