Time regarded as a coordinatedimension and required by relativity theory, along with three spatial dimensions, to specify completely the location of any event.
第四维，第四元：在相对论中指时间，同其它空间三维一起来确定任何一事物的位置。
2
In the paper the calculation methods of the coordinatedimension will be discussed and analyzed, and another calculation method will be put forward to make it more perfect.
本文对坐标尺寸的计算方法分析研究，提出了坐标尺寸的另一种计算方法，使计算更为完善、有规律可循。
3
In allusion to these problems, a plasma sheath model in an oblique magnetic field, which has one dimensioncoordinate space and three dimensions speed space, has been build.