It's on sunday means that something is scheduled or planned to happen on a specific sunday in the future, while it's sunday today means that today is currently sunday. Sunday 解析如下： 一、单词读音 英 [ˈsʌndɪ] 美 [ˈsʌndɪ] 二、单词释义 星期日；周日；星期天；礼拜天 三、词形变化 复数：sundays 四、词语搭配 on sunday 在星期天 on sundays 每个星. 为什么“星期一”是monday而不是sunday？一周七天到底是怎么命名出来的？ 关注者 4 被浏览 3,827
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So the difference is in the. On sunday 是特指一个星期天 英 [ɔn ˈsʌndi] 美 [ɑn ˈsʌndi] 例如:i will leave on sunday. On sundays 是指一般的星期天 例如 i swim on sundays.
