当光标从 HTML 元素移出然后又移回此元素时，淡入淡出会反转方向。

The fading reverses direction as the cursor moves away from, and then returns to, an HTML element.

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这个工具提示会跟随鼠标的移动，即使在淡入和淡出期间，而且当光标从HTML元素移出然后又移回此元素时，淡入淡出会反转方向。

The tooltip follows the cursor as it moves, even as it fades in and out, and the fading will reverse direction when the cursor moves away from the HTML element, or back over it.

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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。

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.

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If the current is sent in the opposite direction, the polarization is reversed.

如果当前发送一个相反的方向，磁极指向就反转。

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