cepheid

例句：

1. 1. The ancient Greeks believed that the cepheidis were guardians of the sea.
   古希腊人相信海神座是海洋的守护者。
2. 2. The cepheidis are often depicted on Greek pottery as symbols of the gods.
   在古希腊陶器上，海神座经常被描绘成神的象征。
3. 3. In ancient Greek mythology, the cepheidis were said to have the power to control the tides.
   在古希腊神话中，海神座据说拥有控制潮汐的力量。