time calculation

• 时间计算

time calculation的用法和样例：

例句

1. Select the hierarchy of the time dimension to be used to create the new time calculations.
   选择要用来创建新时间计算的时间维度的层次结构。
2. Under the spherical coordinate, the tsunami propagation model is built to simulate the transoceanic-tsunami travel time by finite difference method.
   本文基于强震台网提供的地震要素，从理论上讨论海啸预警时间计算方法。