before you know where you are

• 立即,转眼之间

before you know where you are的用法和样例：

例句

1. They are ready to start at short notice.
   他们已准备好，一接到通知就立即出发。
2. We'll let you know immediately when we find it.
   我将通知保安部来处理，我们一找到便立即通知您。
3. You want to see a doctor at once.
   你必须马上去看医生。
4. You are not obliged to return the book soon.
   您没有义务马上还书。