... last set；最后校准 last snap ring；末端开口环 last test；最后试验 ...
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末端开口环
End opening ring
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他同样用绕有许多圈数金属丝的环型或圈状物做了一个简单的接收器，在这个（开口）环形的末端是以微小间距隔开的小金属片。
He also built a simple receiver made of wire that was turned many times in a circle or looped. At the ends of the loop were small pieces of metal separated by a tiny amount of space.
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