令人难过的是，人们认为附近的陌生人不想交谈，因此也不会主动发起谈话。

The sad thing is that people presume that a nearby stranger doesn't want to converse and don't start a conversation.

youdao

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。

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.

youdao

因此，我们的祖先就是这些能哭的婴儿。他们不太容易被留在家中或与陌生人在一起，于是从理论上说，就不太可能受到伤害，“白令说。”

"As a consequence, these babies - who were our ancestors - would have been less likely to find themselves left at home or with strangers," and theoretically less likely to be harmed, Bering says.

youdao