Ibd
离子束穿孔；炎症性肠病
🗣️ 情景例句
And while you're here,
趁你现在在这，
It is my pleasure to introduce the keynote speaker for today.
我很荣幸地介绍今天的主讲人。
Once you begin，you must continue.
一旦开始，你就得继续。