endless/ˈendlɪs/
adj.1. 无尽的；永远的There is endless work to do when you have children in the house.当你家里有了孩子时，你就有干不完的活。
The aircraft was able to fly over the endless white plains without difficulty.飞机能够毫无困难地飞越这一望无际的茫茫雪原。
The voyage seemed endless.这次海上航行的旅程似乎没有尽头。
2. 环状的