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重点讲解：
1. on the lookout for 密切留意；小心提防；
The public should be on the lookout for symptoms of the disease.
公众应当留心这种疾病的症状。
2. in a flash 转瞬；一瞬间；
The answer had come to him in a flash.
他一下子就有了答案。
3. in the blink of an eye 一眨眼的工夫；转眼之间；瞬间；
It was all over in the blink of an eye.
转眼之间，一切都结束了。
4. in case 以备；以防；免得；
She is afraid to contact the social services in case they are labelled a problem family.
她不敢联系社会服务部门，以免被当作问题家庭。
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