Hemiketal
[机] 半缩酮
🗣️ 情景例句
Oh, here are my certificate of merit.
哦，这里是我的获奖证书。
Please leave me alone.
请别打扰我。
This race, which went on for exactly four exactly four months, was the last of its kind.
这场比赛持续了整整4个月，是这类比赛中的最后一次，