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重点讲解：
1. turn up 找出；发现；注意到；出现；
Investigations have never turned up any evidence.
调查从没发现任何证据。
2. poke around （通常指挪动很多物品）寻找，翻找；
He poked around the top of his cupboard for the bottle of whisky.
他翻遍了食橱的上层，想找那瓶威士忌。
3. participate in 参与；参加；
No professionals may participate in the amateur tennis tournament.
任何职业选手均不得参加业余网球锦标赛。
4. happen to do sth. 碰巧；凑巧；
If you happen to talk to him, have him call me.
如果你碰巧能和他说话，让他给我打个电话。
vt. 分享
vi. 参加，参与
