endless
/ˈendlɪs; `ɛndlɪs/ adj
1 (seemingly) without end （似乎）无止境的; 无穷尽的
endless patience 无限的耐心
an endless choice of things to do 可做之事数之不尽
The hours of waiting seemed endless. 等候了很多小时, 似乎无尽无休.
2 (of a belt, chain, cable, etc) with the ends joined; continuous （指带、 链、 缆等）两端相连的, 循环不断的
wheels in a machine driven by an endless belt 用无极带传动的机器轮子.