暗楔榫 [木] secret dovetailing
暗杆楔式闸阀 non-rising stem wedge sluice valve ; non-rising stem wedge gate valve ; INSIDE SCREW WEDGE GATE VALVES
暗杆楔式单闸板闸阀 Non Rising Stem Single
暗楔
Blind wedge
以上为机器翻译结果，长、整句建议使用 人工翻译 。
为实现免散瞳眼底相机在被观测眼底图像较暗情况下的精确调焦，提出了双光楔裂像调焦方法。
A focusing method by adjusting two slit mark images was proposed to realize accurate focusing of a non-mydriatic fundus camera for an observed retina image in dark.
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