springn.春天；春季；弹簧；弹力；跳；泉水；源头v.跳；弹；快速站起；突然提出；触发捕捉器；(使)裂开；爆炸；释放；涌出；生长；出现；耸立；(风)开始吹springhack回弹

1. How do I increase or reduce spring tensioning?
   如何增加或减小弹簧张力？
2. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension.
   和人们认为的不同，活塞环不能靠弹簧张力来密封燃烧室的压力。