as right as rain

一帆风顺，一切正常

rain buckets

大雨倾盆，余下的很猛烈

ain cats and dogs

大雨倾盆，雨下得很猛烈

rain praise on

对...赞不绝口

take shelter from the rain

躲雨，避雨

It never rains but it pours.

不鸣则已一鸣惊人

rain tears

泪如雨下