289 Prepositions, space and time 时空介词 (shíkōng jiècí)

by the time, when

9 等到 [-] děngdào (wait-to) by the time, when: ~九点以后, 你就可以 唱歌了. By nine o’clock, you can sing. || ~你生日那天才能打开. You can’t open it until your birthday. '

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