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环生

环生

自第2体节始具刚毛，环绕体节排列，称环生（Pperichaetine）。刚毛简单，略呈S形，大部分位于体壁内的刚毛囊中。

环_百度百科 ... 16.环论[ ringtheory] 21.环生[ takeplaceoneafteranother] 22.环蛇[ krait] ...

His work was of great difficulty , and trouble appeared ceaselessly.

The main Piston Rings Producing base to Produce Flying Swallow Piston Rings

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