沉沦的英文：
sink into

参考例句：

He sank into vice, deeper and deeper.
他沉沦下去，越陷越深。

Must I sink down there, and die at once?
我应该沉沦于此，并且马上死掉吗？

sink是什么意思：
v. （使）下沉；渐渐进入；淹没；消沉；渗透；挖掘
n. 洗涤槽

sink into a decline
开始衰落，衰弱下去，体力衰退

Sink or fall to a lower level.
下沉或下降到更低的水平。

swallow hold (sink, sinkhold)
落水洞

Many sands will sink a ship
积沙沉船

There's a backup in the sink.
下水道堵塞。

into是什么意思：
prep. 进入…中；进入…状态；持续到；输入