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Jyutping zing3 zo6
Pinyin zhèng zuò

Definitions (Wiktionary)
  1. verb, literary
    to sit upright; to sit ramrod straight
    (syn.) 端坐
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他正坐在会议室里。
    他正坐在會議室裏。
    tā zhèng zuò zài huì yì shì lǐ 。
    • He's sitting in the meeting room.
  2. Mandarin
    玛丽正坐在办公桌旁。
    瑪麗正坐在辦公桌旁。
    mǎ lì zhèng zuò zài bàn gōng zhuō páng 。
    • Mary is sitting at the desk.
  3. Mandarin
    在那个时候,汤姆正坐在玛丽和约翰中间。
    在那個時候,湯姆正坐在瑪麗和約翰中間。
    zài nà ge shí hou , tāng mǔ zhèng zuò zài mǎ lì hé yuē hàn zhōng jiān 。
    • At that time, Tom was sitting between Mary and John.