Below him plummets a vertical mile of water column .

一个垂直英里的水柱在他身后垂直落下。

Your pace time plummets and your results seem worthless .

你的步伐开始变慢并且你的努力看起来毫无价值。

As the oil price plummets , unemployment may rise dangerously .

随着油价骤然下跌，失业可能危险性地上升。

What happens to these vast dollar reserves that china holds , that could be literally worthless if the value of the american currency plummets ?

中国持有大量的美元储备，不夸张地说，这也许不值得，如果美国货币价格垂直下滑，那又会发生什么？

When we stay in these relationships , we become increasingly depressed ; our self-esteem plummets further .

如果一直保持这些关系，我们就会对生活变得越来越沮丧并进一步贬低了自尊心。