1. The ancient Greeks used a clepsydra to measure time by the flow of water.
古希腊人使用clepsydra通过水流来测量时间。

2. The clepsydra was an early form of timekeeping device.
clepsydra是一种早期的计时装置。

3. The clepsydra was filled with water and marked with lines to indicate the passage of time.
clepsydra装满水，并标有线条以指示时间的流逝。

4. The clepsydra was used in various ancient civilizations to regulate activities and appointments.
clepsydra在各种古代文明中被用来调节活动和约会。

5. The invention of the clepsydra revolutionized the way time was measured in ancient societies.
clepsydra的发明彻底改变了在古代社会中测量时间的方式。

6. The clepsydra was an important tool for astronomers and mathematicians in ancient times.
clepsydra是古代天文学家和数学家的重要工具。