Ibd
离子束穿孔；炎症性肠病
🗣️ 情景例句
why you have so many problems with math.
为什么你在数学方面有那么多问题。
Have you heard the weather forecast?
你听天气预报了吗？
I want to take some books to the classroom. Could you help me, please?
我想把一些书拿到教室里，你能帮个忙吗？