The main drain was blocked.

主下水道被堵住了。

《柯林斯英汉双解大词典》

The main breeding sites were pools, drain, waterbeachs and tyres.

重要滋生环境为积水池、排水沟、积水滩和轮胎。

youdao

The spectra of the main elements of the drain-source voltage can be found in Fig. 20.

图20描述了漏源极电压主要原理产生的电磁干扰频谱。

youdao

Fountains of water still spew forcefully from almost every drain and gulley, and the main roundabout into St Asaph from the A55 remains impassable.

BBC: Ruthin floods: Alarm raised by postman who saw river rise

Thousands of light bulbs illuminate the gigantic main terminal and unused parking lots around the clock, a massive energy and cost drain that appears to be the result of a computer system that's so sophisticated it's almost impossible to operate.

NPR: Berlin's Airport Project Delays Shame Germans