重点讲解：
1. engage in 参与；从事；
例句：You can engage in croquet on the south lawn.
你可以参加南边草坪上的槌球游戏NShn~.DU=qWB!^3。
2. put sth. to the test 使经受检验；对…进行试验；
例句：Arriving at the railway station, I put local knowledge to the test and ask a taxi driver.
到了火车站，为了检验自己对当地的了解程度，我请教了一个出租车司机!iOU--Z9k=|Mam-javu。
3. interact with 相互交流；相互沟通；
例句：Partners must interact with each other's ideas.
合作伙伴必须相互交流想法)6HsLxo5bn,。
4. serve as 用作；可当…使用；充作；
例句：She ushered me into the front room, which served as her office.
她把我领进了她用作办公室的前厅73pVtR3SCnI(。