During el nino events, phytoplankton productivity in the equatorial Pacific declines dramatically as the easterly trade winds that normally drive upwelling grow still or even reverse direction.
发生厄尔尼诺事件时，由于偏东信风停止了本应推动的上升流甚至反转了方向，赤道太平洋的浮游植物生产力明显下降。
It is believed that priority is given to reverse direction drive in the case that it may be driven in ether direct or reverse direction, especially under large water flushing conditions.
并认为在斜井既可正掘又可反掘的条件下，尤其是在涌水量较大的情况下应优先考虑反掘方案。
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