定义 中文名称： 背环 英文名称： tergites ring 定义： 指瘿螨的背片，半环纹宽窄不一，边缘或环间常有各种形状的微瘤。 应用学科： 昆虫学（一级学科）； 蜱螨学（二级学科） 以上内容由 全国科学技术名
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黑背白环蛇 Lycodon ruhstrati ; white plum blossom snake
针阀背环工具 needle valve BUR former
扭背环 twisted back around
背带环 Sling swivels ; suspender loop ; Sling Swivel Mount
汉堡环保背包专卖店 F-Shop Hamburg
环境背景值 [环境] environmental background value ; ronmental background value ; environment background value
背压环 back-up ring ; bair coolingk-up ring
背锁式接环 breech lock mount
其腹面口区具二环围口纤毛列；背面具一列背刚毛。
There are two circumoral ciliary rows on the buccal region and a dorsal row of bristles.
为了减少磨损，提高活塞环的使用寿命，对整体无背压活塞环的设计进行了研究。
The design of integral non-backpressure piston rings was studied in order to reduce wear and to raise the piston ring life.
分别对开口有背压活塞环和整体无背压活塞环的工作原理和结构作了阐述。
The work principle and structures of backpressure piston rings and integral non-backpressure piston rings were expounded.
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