做菜的时候，最好先把所有食材洗干净。

Zuò cài de shíhou, zuìhǎo xiān bǎ suǒyǒu shícái xǐ gānjìng.

When cooking, it’s best to wash all the ingredients first.

做这个书架需要准备一些木材。

Zuò zhège shūjià xūyào zhǔnbèi yìxiē mùcái.

To make this bookshelf, we need to prepare some wood.