It never rains but it pours.

不雨则已，雨则倾盆。

It never rains but it pours.

不雨则已，一雨惊人。

Like what they say, it never rains but it pours .

这真像人们说的，祸不单行。

I broke a fingernail, laddered my tights and then missed my train– it seems it never rains but it pours.

我弄破了我的指甲，紧身衣裤抽了丝，并误了火车-乎真是祸不单行。

B: Just as the saying goes, it never rains but it pours.

正如俗话所说，祸不单行。