Are you sure you should be up?
你肯定你该起床了吗?
Are you sure you locked the front door?
你确定锁前门了吗?
你确定吗,汤姆?
Are you sure you have to go out of town? Oh, yeah, it's a little family thing.
VOA: standard.other
Are you sure you didn't want to do for i in range of list, rather than for i in list?
你真的打算这么做吗?你确定你不是,想在链表范围内定义i而不是定义链表i?
You just got to be looking around all the time to make sure you are not going to be run down.
你随时观察四周以确保你不会被撞倒。
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