yánjiū / rényuán / cháng / bǎ / fùzá / de / ruǎnjiàn / xìtǒng / lèibǐ / chéng / yí / zuò / chéngshì / yǐbiàn / xiàng / fēi / zhuānyè / dúzhě / jiěshì / gègè / mókuài / de / guānxì

研究人员常把复杂的软件系统类比成一座城市，以便向非专业读者解释各个模块的关系。

Researchers often compare a complex software system to a city in order to explain the relationships among its modules to non-specialist readers.