1. Advancing suburban assurance is the difficulty and keystone of domestic insurance enterprise. 发展农村保险是我国保险业发展的难点和重点。
2. The keystone of the article is analyzing industry structure of He Bei, analyzing industry from whole angle. 本文的重点是对河北省产业结构的分析,从整体的角度来分析河北省产业情况。
3. Stating the function and usage of Keystone slotted pipes, Keystone slots manufacturing method by laser reliability of Keystone manufacturing method by laser. 简述了梯形缝筛管的作用、用途及激光加工梯形缝的方法和激光加工梯形缝筛管的可靠性。
英英解释
n.
1. a central cohesive source of support and stability
2. the central building block at the top of an arch or vault