keystone

The premise of designing and creatin g Chongqing's tourism image is to rec ognize its advantages and keystone o f devel-opment.

设造重庆旅游象的前提,是己的优势发展重点。

Also, the possibility of keystoning using the microscope stage for motion and a glass needle fixed to the microscope head should be evaluated.

同样，可能采用的楔提取所用到的显微镜平台（运动以及安置在显微镜头上的玻璃针）也将被评估。