Obamacare
奥巴马医改计划
🗣️ 情景例句
If you don't know a person's last name, use 'ma'am' or 'sir'.
如果你不知道一人的姓， 你应称呼他为 'ma'am' 或 'sir' 。
No, No. You can't do it like that.
不行，不行。不能随你那样做。
It is because his feet move on, but his head stays still.
这是因为他的脚动了，而他的头保持着静止。