hold-on coil

例句：

1. 1.The car's engine is holding on to its power.
   汽车的引擎正在努力保持其动力。
2. 2. The spring in the door keeps it from closing completely.
   门上的弹簧使门不能完全关闭。
3. 3. The coil of wire is holding up the ceiling.
   电线圈支撑着天花板。