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重点讲解：
1. round up 围捕；逮捕；
We've rounded up a selection of products.
我们已经精心挑选了一些产品。
2. settle on 选择；选定；
They could not settle on where top spend the holiday.
他们还决定不了到哪儿去度假。
3. take to 养成(做…)的习惯；开始定时(做…)；
They had taken to wandering through the streets arm-in-arm.
他们养成了挽着胳膊逛街的习惯。
4. play it safe 谨慎行事；避免冒险；
Just play it safe, cover your ass, keep your head down.
要谨慎行事，保护好自己并保持低调。
adj. 永久的，永恒的
动词last的现在分
