It never rains but it pours.
不雨则已，一雨倾盆。
youdao
It never rains but it pours, as the saying goes.
谚语说，不雨则已，一雨倾盆。
First his car broke down, then he lost my key-it never rains but it pours!
先是他的汽车出了故障，接着又丢了钥匙——真是祸不单行！
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