周末意味着一个特定的周末;周末意味着一个特定的周末。On是一个特定的时间,比如某件事情正在发生的晴天;或者年,世纪。周末就是周末。周末是特定的两天,而不仅仅是一天中的任何时间。用在。at是星期或小时的介词[详细]
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