Gnotobiota
限菌區(qū)系, 既知菌區(qū)系
??? 情景例句
If you waste all your time playing computer games, you'll never get anywhere in life.
如果你花過多的時間在電腦游戲上，你將前途黯淡。
Right on, Packers!
加油，博卡茲！
No. He just asked if you could ring him back. Here's the number.
沒有，他只問你能不能給他回一個電話。這是他的電話號碼。