窗口 (chuāng kǒu) means “window; opening providing restricted access (e.g. customer service window); computer operating system window; fig. medium; intermediary; showpiece; testing ground”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
请到第三窗口办理业务。
Qǐng dào dì sān chuāngkǒu bànlǐ yèwù.
Please go to window number three to conduct business.
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