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重点讲解：
1. be full of 充满
Her eyes were full of mischief.
她眼睛里满是使坏的神情。
2. take pictures 拍照；照相
The tourists have nothing to do but take pictures of each other.
游客们无事可做，只有相互拍照。
3. look for 寻找
They look for foods that are low in calories.
他们寻找低热量食物。
4. as long as 只要
I haven't known him as long as you.
我认识他的时间没有你长。
