游客们与陌生人拉着手、吃力地走上拥挤的山坡，就像工蚁们一样正在完成一项特别庄严的使命。

Visitors slog up a crowded, hillside holding hands with strangers like worker ants on a particularly gruesome mission.

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特别是与陌生人一次性的交往，就更难解释为什么人类没有选择自私的行为。

And when those encounters are one-off events with strangers it is even harder to explain why humans do not choose to behave selfishly.

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特别是试图与陌生人聊天。

This is especially true when trying to talk to strangers.

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