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重点讲解：
1. now and again 有时；偶尔；时常；
Now and again he'd join in when we were playing video games.
我们玩电子游戏时，他偶尔会和我们一起玩。
2. come up with 想出，提出(计划、想法等)；
Keep your eye on these jokers, you never know what they will come up with.
留神那些活宝，你永远也不知道他们会想出什么样的主意。
3. pick up the tab 付账，承担费用；
Pollard picked up the tab for dinner that night.
那天的晚饭是波拉德掏的钱。
4. engage in 参与；从事；
I have never engaged in the drug trade.
我从未参与过毒品交易。
adj. 好奇的，奇特的
