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重点讲解：
1. come across 偶然发现；偶然遇见；
I've never come across such an experience in my time.
我一生中从没有经历过这样的事情。
2. be capable of 有…能力的；能够…的；
You are capable of better work than this.
你有能力做得比这更好。
3. set out to do sth. 开始；着手；
We set out to find the truth behind the mystery.
我们开始着手揭开谜团背后的真相。
4. come along (尤用于鼓励别人参加某活动)来吧，一起来；
There's a big press launch today and you're most welcome to come along.
今天有一个大型的媒体推介会，非常希望您能光临。
adj. 有效的，有影响的
