温度突然急剧下降，让我们措手不及。

The temperature took a ___plunge, catching us by surprise.

瀑布从悬崖边缘急速落下。

The waterfall was ___plunging from the edge of the cliff.

她的黑色礼服配有一条深V领口，非常优雅。

Her black dress features a ___plunging neckline, looking very elegant.

炎热的夏天，孩子们兴奋地从跳板上扎进游泳池里。

On a hot summer day, the kids were excitedly ___plunging into the pool from the diving board.