滂沱大雨的英文：
a drench of rain

参考例句：

Sheeted rain
滂沱大雨

Rain sheeting against the windshield.
滂沱大雨打在挡风玻璃上

At least 150 people are believed to have died after two days of torrential rain deluged the capital.
连续两天的滂沱大雨致使首都积水成灾，据信至少已有150人死亡。

drench是什么意思：
n. 滂沱大雨；弄湿
v. 使湿透；使充满；给（牲畜）灌药

He met a drench of rain.
他遇上一场倾盆大雨。

A heavy shower drench the campers.
一阵骤雨把露营者都淋湿了。

Drench coccus is a kind of bacterium.
淋球菌是一种细菌。

My shirt is drench with sweat.
我的衬衫被汗水湿透了。

She drenched in moonlight.
她沉浸在月光中。

rain是什么意思：
n. 雨；降落物；雨季
v. 下雨，降雨；像雨点般落

What if it rains?
要是下雨怎么办？

It rained at intervals.
雨时下时停。

It has stopped raining.
雨停了。

The next day, rain or no rain, it was business as usual.
不管第二天下不下雨，一切事情照旧。

As rain has fallen, the air is cooler.
由于下了雨，空气比较凉爽。