"12 o'clock" 表示中午12点。 "o'clock" 来自英语中的 "of the clock" 的缩写，意为 "钟上的"。
例句：
"I'll meet you at 12 o'clock." (我会在中午12点和你会面)
"I always wake up at 12 o'clock." (我总是在中午12点醒来)
"Please be here at 12 o'clock sharp." (请准时在中午12点到这里)
如果你想表达晚上12点，你可以说 "12 o'clock at night" 或 "midnight" (午夜)。
例句:
"I'll call you at 12 o'clock at night." (我会在晚上12点给你打电话)
"I always sleep at 12 o'clock at night." (我总是在晚上12点睡觉)
"Please be here at midnight sharp." (请准时在午夜到这里)