重點講解：
1. hunt for
搜尋；尋找；
eg. Bats sleep in the daytime and come out to hunt for food at night.
蝙蝠白天睡覺，而夜間出來覓食。
eg. He turned the room upside-down to hunt for the lost key.
他把屋子翻得亂七八糟，尋找遺失的鑰匙。
2. be set to do sth.
做好準備的；可能做某事；
eg. He is set to pulverise his two opponents in the race for the presidency.
他決心在總統競選中徹底擊垮他的兩個對手。
eg. All my bags are checked in. I guess I'm all set to go.
我的行李都檢查完了，看來我可以走了。
3. step in
介入，干預，插手（棘手問題）；
eg. There are circumstances in which the State must step in to protect children.
有些情況下，國家必須出面保護兒童。
eg. If they step in where they're not wanted, they'll get their noses put out of joint.
如果他們介入與他們無關的事，會有人阻止他們的。