Míngzhī / páishuǐ / xìtǒng / yǒu / wèntí / hái / wǎng / lǐmiàn / dào / yóu / jiǎnzhí / shì / zài / yǐn / shuǐ / rù / qiáng

明知排水系统有问题还往里面倒油，简直是在引水入墙。

Knowing the drainage system was faulty, he poured oil into it anyway, practically asking for trouble.