John Olson first found fortune as a 13-year-old when he volunteered to sit apart from his classmates on the airplane during a class trip. "I ended up in first class," he says.

John Olson 13岁时找到人生第一笔财富，在一次班级旅行的飞机上，他自告奋勇地坐在远离同学的座位上。

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A group of foreign visitors came to sit in on our English class yesterday.

昨天有一批外宾来听我们的英语课。

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It takes a bit more effort, but kids should sit in on a college class.

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One day, his university class has the opportunity to sit in on a war-crimes trial.

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Joe and Frank Venezia used to sit in class like a couple of dummies -- they never kept up on the reading.

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