s. too numerous to be counted
a. 数不尽的, 无数的
1. There are countless stars in the night sky.
夜空中有无数的星星。
2. She has countless ideas for her new project.
她对她的新项目有无数的想法。
3. We faced countless challenges during the trip.
在旅行中我们遇到了无数的挑战。