base-ring and frame-ring
collector ring (slip-ring)
column-ring beam joint with shear ring bars
outside ring in-feed system ring
ring of n×n matrices over ring R
ring out the old year and ring in the new
Riser-ring and Ring Module
short-proof ring (arcing ring)
the Western Ring Road Sector of Central Ring Road
anal ring hairs anal ring setae
bailing
汲筒滑车
提捞
捞砂
提捞作业
白岭
抽水
用泥浆泵清理钻孔
抽汲
Bailing copper and zine deposit