operate/operator/operation/ambulance/cooperation
记忆：
1. operate [ 5CpEreit ] v. 操作, 运转, (~ on)动手术 Can you operate the new equipment to operate on the patient with a heart stroke?你会操作新的设备来为那个心脏病人做手术吗？
2. operator [ 5CpEreitE ] n. 操作员, 工作者, (电话)接线员 The operator can help you find out his number. 接线员能帮助你查到他的号码。
3. operation [ 7CpE5reiFEn] n. 运转, 操作, 实施, 手术, 军事行动 The operation turned out to be a disaster to both sides. 那次行动结果对双方来说都是一场灾难。
4. ambulance [ 5AmbjulEns ] am-bu-lan-ce 音似“俺不能死”，快叫救护车， n. 救护车 Call for an ambulance at once! It’s in emergency! 马上叫救护车！情况紧急！
5. cooperation [ kEu7CpE5reiFEn] n. 合作 Some modern scientific research is in such a great scale that it can’t be successful without international cooperation. 一些现代科学研究规模如此之大此致于没有国际合作就不可能成功。
6. opera [5RpErE] n. 歌剧 I wonder how many young people can stay an hour watching an opera?我想知道有多少年青人能呆一个小时看歌剧？
另类阅读：
While operating on the badly-injured operator taken there by an ambulance, the major doctor called for other doctor’s cooperation.