plain ring 光面戒指 ; 平垫圈 ; 矩形断面活塞环
plain pressure ring 平接压力环
Carbide plain ring 钨钢光滑环规
Ceramic Plain ring 陶瓷光滑环规
PLAIN RING GAUGE 光滑环规 ; 普通环规
plain piston ring 平活塞环
plain compression ring 普通压缩环
Fry plain roll ring 炸素卷圈
But far from being the height of fashion, Mona Lisa's dress is utterly plain and timeless and, despite the fact that she is a married woman, she wears no jewellery, not even a wedding ring.
这幅画作里的蒙娜丽莎却没有显现出当时的潮流，她穿着的服装朴实无华，完全看不出来她是个已婚的女性，既没有佩戴珠宝也没有戴戒指。
The merchant took a plain gold ring from his carpet and engraved something on it.
那位商贩从地毯上拿起一枚普通的金戒指，在上面刻了些什么。
Plain Ring and Snap Gages for checking the major diameter.
普通环规与卡规是为了检测大径。
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