concave rim的意思|示意

It is a sloping green valley, concave in shape, its upper rim coming in direct contact with a series of enormously high cliffs that rise almost vertically.

这是一处倾斜的绿色山谷，呈凹形，山谷上缘直接连接连绵的、高不可攀、近乎垂直的悬崖。

Align the ring-form concave of pressing jaw with the rim on press-fitting, in groove of which a rubber ring is mounted, and compress it bv pressing tools.

把卡压工具钳口的环状凹部对准管件端部内装有橡胶圈的环状凸部进行卡压。