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Jyutping zyun3 pun2
Pinyin zhuàn pán

Definitions (Wiktionary)
  1. noun
    baggage carousel
  2. noun
    turntable; spinner
  3. noun, Mainland-China
    roundabout; traffic circle
Definitions (兩岸三地生活差異詞語彙編—Two Shores Three Places)
  1. 交通設施:臺
    圓環
  2. 交通設施:陸
    轉盤、環島、環形交叉
  3. 交通設施:香
    迴旋處
  4. 交通設施:澳
    圓形地、迴旋處
  5. 差異說明
    大陸​通常​將​「​圓環​」​稱作​「​環島​」

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Jyutping zyun3 pun4
Pinyin zhuàn pán

Definitions (CC-CEDICT)
  1. turntable
  2. rotary (traffic)
Examples (Wiktionary)
  1. Mandarin
    把车开上转盘
    把車開上轉盤
    bǎ chē kāi shàng zhuǎn pán
    • to drive one's car onto a roundabout