牙刷

wǒ yào mǎi yī bǎ yá shuā

我要买一把牙刷。

I want to buy a toothbrush.

dāng nǐ yào qù lǚ yóu shí bié wàng le dài nǐ de yá shuā

当你要去旅游时，别忘了带你的牙刷。

When you travel, don't forget to pack your toothbrush.

wǒ men yào qín shuā yá cháng huàn yá shuā

我们要勤刷牙，常换牙刷。

We need to brush our teeth regularly and change our toothbrushes often.