to rain cats and dogs meaning in Chinese

下倾盆大雨

I was about to leave , when it began to rain cats and dogs
我正要离开。这时候下起了倾盆大雨。
In the middle of the picnic it started to rain cats and dogs , and everybody got soaked
野餐进行到一半时，天开始下起大暴雨，弄得每个人都湿透了。
In the middle of the picnic it started to rain cats and dogs , and everybody got soaked
正在进行野餐的时候忽然下起了倾盆大雨，人人都淋得像落汤鸡。