Quindecennial
十五年期间\\na. 每十五年发生一次的, 持续十五年的
🗣️ 情景例句
Normally I go to bed at about ten o'clock.
通常我在 10:00 睡觉。
When one is about to act, one must reason first.
凡事要先思而后行。
And because I was deaf, I could not learn to speak.
因为我耳聋，我不能学说话。