利用流沙計時的器具。 雖能直觀地確認時間，但維護起來並不方便。
A device that measures time using falling sand. It allows you to intuitively confirm the time, but is cumbersome to maintain.
利用流沙計時的器具。 雖能直觀地確認時間，但維護起來並不方便。
A device that measures time using falling sand. It allows you to intuitively confirm the time, but is cumbersome to maintain.