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F,[jmuI3)|*v&R-Pv~Ur。
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Q!#AV@jO,T7K4du#I。
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8Idk;3pn~,iR。
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k_z9%If8i!wU-K]Uf=。