shift conversion的用法和樣例：
例句
- Properties of mode conversion in a nonlinear conical graded-index medium are investigated.
研究非線性錐型梯度折射率媒質中的模式變換特性。 - China's greatest worry comes from rain, the continuous deluges that will occur during the days that follow the pole shift.
困擾中國的最大的問題是降雨，兩極變換之後的日子裡，緊接著會發生持續不斷的暴雨及洪水。
