1 sentence

1. 你应该每个月给自行车轮子加一次润滑油。

   nǐ yīng​gāi měi​gè yuè gěi zì​xíng​chē lún​zi jiā yī​cì rùn​huá​yóu.

   You should lubricate the wheels of your bicycle once a month.

   Source: UM-Corpus: Education