In simplest terms, piston rings are thin, circular pieces of metal that fit into grooves in the tops of the pistons.
简单地讲，活塞环就是装在活塞顶部的凹槽里的薄，圆的金属。
As I said, they make the tops too thin, believing that it is a bigger sound, and they are absolutely wrong.
如我曾经说过的，他们把面板做的太薄，且相信这样会制造出音量更大的吉他，但是他们完全弄错了。
The tops of the beggar's shoes had worn so thin that his toes were poking through.
叫化子的鞋帮磨得很薄，脚趾头快要出来了。
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