重点讲解：
1. as soo as 一…就…；
例句：As soon as I have time, I will call you up.
我一有空，就会打电话给你。
2. stare at 凝视；盯着看；
例句：When he had gone I could only stare at the boxes.
他走后，我吃惊地盯着这些盒子。
3. in the middle of 中部；中央；中间；
例句：He is standing in the middle of the classroom.
他正站在教室中间。

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