Astronomy served many purposes. For one thing, it was needed to keep a calendar.

  • 天文学有许多用处, 其一是要用它来算出历书.

  • 词典精选例句 2025-01-18 14:24:28

    • 相关例句
    精确
    • 模糊
    • 词首
    • 词尾
    • 词义
    • 例句