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重点讲解：
1.go on vacation 度假
例句：When we go on vacation, we take a lunch to eat while on the road.
度假时，我们带了许多午餐在路上吃。
2.go off to 动身前往
例句：The explanation given was that the bombers spend all night psyching themselves up, then say their prayers at dawn, and go off to murder.
解释是，炸弹袭击者要花一整晚给自己做好心理准备，然后在黎明时做祷告，接着引爆杀人。
3.mingle with 和...混合；交往
例句：He condescended to mingle with the workers.
他屈尊与工人们交往。
4.make fun of 取笑
例句："Do not make fun of an old man, " said the gentleman.
“别拿老人开心了，”绅士说。
