Peritrichida
[医] 围口纤毛虫目
🗣️ 情景例句
I have to sign copies of my book for a lot of people
我还必须为许多人在我的书上签名
I've realized that we should stop the pollution.
我明白必须阻止公害的原因了。
That sounds strange.
这听起来很奇怪。