Antarctic bottom current is the main influence aspects to the formation of polymetallic nodules.
南极底流是影响多金属结核形成的关键因素。
An empirical formula of depth-averaged velocity is derived by means of dimensional analysis, and at the same time the characteristics of the variation of bottom current velocity are described.
文中还利用量纲分析，导出了挖槽中心垂线平均流速折减系数的经验公式。
The diagram in Figure 4 shows the use of layers to highlight a change over time, with the top screen capture showing the current model and the bottom one showing the next version of the model.
图 4 中的图显示了层的使用，以强调随着时间发生的更改，图上方的屏幕截图显示了当前的模型，图底部的屏幕截图则显示了模型的下一个版本。
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