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at noon 为什么要放在>背面/h2>
加at, 因为noon是指中午十二点,在时刻前用at,在日前用on, 在年和月前用in,
还有一些固定短语in the morning, in the afternoon, in the evening, at night, at noon
当morning,afternoon, evening, night,noon前有修饰的成分时要用on

(图片来自网络侵删)
如on a snowy morning