red-light district
US /ˈrɛdˌlaɪt ˈdɪstrɪkt/
UK /ˈrɛdˌlaɪt ˈdɪstrɪkt/

1.
紅燈區, 風化區
an area of a town or city containing many brothels, strip clubs, and other sex-oriented businesses
:
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The old port area used to be a notorious red-light district.
舊港區曾是一個臭名昭著的紅燈區。
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Tourists are often warned to avoid the city's red-light district at night.
遊客常被警告晚上要避開城市的紅燈區。