jumping-off point /ˌdʒʌmpɪŋˈɒf pɔɪnt/

• 1. 

  N-SING A jumping-off point or a jumping-off place is a place, situation, or occasion that you use as the starting point for something. 起点; 开端

  例：

  The base will serve as a jumping-off point for troops going out into the country areas.

  基地将作为军队进入乡村地区的出发地。