frame cushion keystone 帧梯形失真
A wooden frame built especially to support the sides of an arch until the keystone is positioned.
支拱板条专门用来在拱顶石放置好以前支撑拱的两边木架子。
In this dissertation, the keystone of Differential Interference Contrast Microscope is analyzed, and the optics and machine frame of Microscope is illuminated briefly.
本文首先详细分析了微分干涉相衬显微镜的光学系统原理，然后对显微镜光机结构做了简要分析。
The joint of a frame is the keystone in structural design, the stress with a complicated distribution were concentrated in the connection, that makes the node difficult to be designed and constructed.
梁柱节点是结构设计的重难点之一，其连接处应力集中、应力分布复杂，设计和施工处理都比较复杂。
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