资料来源 : pyDict

潜望镜,展望镜

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Periscope \Per"i*scope\, n. [Pref. peri- + -scope.]
   A general or comprehensive view. [R.]

资料来源 : WordNet®

periscope
     n : an optical instrument that provides a view of an otherwise
         obstructed field