1. 昨天轮到你把它们洗干净。

[ zuó tiān lún dào nǐ bǎ tā mén xǐ gān jìng 。 ]

It was your turn to wash them yesterday.

2. 虽然我们看不见原子，但它们的确存在。

[ suī rán wǒ mén kàn bù jiàn yuán zǐ ， dàn tā mén dí què cún zài 。 ]

Although we can't see these atoms, they really do exist.