拖船必须拥有较大的系柱拖力,但对于挖泥船则不是重要的。
A tug boat has to possess a high bollard pull while that is not important for a dredger.
我们有直角坐标系,有柱坐标系和球坐标系。
We have rectangular coordinates, we have cylindrical coordinates and we have spherical coordinates.
这个地区的地层柱包括全部古生代岩系。
The stratigraphic column in this district includes all the Paleozoic formations.
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