Gerardus Mercator's projection, published in 1569, was immediately useful because it depicts a line of constantbearing as a straight line, which is handy for Marine navigation.
For example, the Mercator projection is widely used by boats and ships because it produces a map in which lines of constantbearing are a straight line, which greatly simplifies navigation.
例如，墨卡托投影是广泛使用艘舟艇，因为它产生的地图中，不断轴承线一条直线，从而大大简化了导航。
3
The quasi-superplasticity of leaded brass for bearing cage was investigated through the constant velocity tensile test.