作者认为，分层事件似应是由沉降粒子所引起，并与极区亚暴具有密切关系。
The authors consider that the stratification events may be caused by precipitation of particles and closely related to polar substorm.
不管这些粒子沉降在哪里，它们会形成一个平面板块，一层水无法渗透的平面。
Wherever these particles settled, they formed a pan, a layer that water couldn't penetrate.
悬浮病毒粒子的沉降率因其大小和密度而异。
The rate of sedimentation of a suspended viral particle depends on its size and density.
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