But later she meets the father on the train: he has abandoned his beloved daughter to strangers because his wife is expecting another child and the family cannot hide more than one.

但是后来她却在火车上又遇到了这个父亲。原来因为他妻子想再要一个孩子，而这个家庭无法隐藏多出来的孩子，因此他将心爱的女儿送给了陌生人。

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Because we didn't get on the train, brave the weather, bump into strangers, and hear music we didn't choose.

因为我们不会随便跳上一台火车，赌赌看运气，随机遇到陌生人，对听的音乐完全不加以选择。

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Sitting on the train, strangers ask you to drink Coke, how to do it.

坐在火车上，陌生人请你喝可乐，该如何做呢。

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Literature fans may want to take a brief side trip to Tegna where the author Patricia Highsmith (Strangers on a Train, The Talented Mr. Ripley) spent the last years of her life (her grave is in the Tegna cemetery).

BBC: Two days in the Italian Lakes

Maybe you've seen the movie Alfred Hitchcock's classic Strangers on a Train.

FORBES: A dark view

That means users will temporarily join the group of people at a birthday party or rock concert even strangers on a train.

WSJ: Money Rushes Into Social Start-Ups