重点讲解：
1. come back 回来；
例句：I persuaded him to come back with all my might.
我竭力说服他回来ouj2b+2x(jT#。
2. stumble across 意外发现；偶然看见；
例句：I stumbled across this silver bracelet in the junk shop down the road.
我在马路边的那家旧货商店里，无意中发现了这个银手镯v&jGG#oKv-p。
3. go back 回去；
例句：The children have to go back to school next week.
下周孩子们要返校了,52~z~7X6FLmXF。
4. all over 到处；遍及；
例句：The news was blazed all over the daily papers.
所有日报都刊登了这条消息YB90RA)OHq,sF)19bb=。