Gnotobiota
限菌区系, 既知菌区系
🗣️ 情景例句
That child behaves just as he pleases.
那孩子想干什么就干什么。
And to stay ahead of the competition is to openly and freely exchange our opinions.
处于竞争领先地位的方法就是公开、自由交换我们的想法
I have had so many falls that I am black and blue all over.
我摔了好几跤，全身又青又紫。