人是群居的动物。
人是群居动物；度过了一个轻松的社交夜；不成熟的社交行为。
Human beings are social animals; spent a relaxed social evening; immature social behavior.
安全一度是群居生活的重要动机。而如今大都市毒祸横流，安定的生活相比城郊更使人难以捉摸。
Security, once one of the main reasons for huddling together, is often now more elusive in the druggy streets of the metropolis than in the exurbs.
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