Periscope



GRE

解释

GRE 红宝书

• n. 潜望镜
• ［英］ 潜望镜 ( a long tube with mirrors fitted in it so that people who are lower down can see what is above them)
• ［记］ peri（周围）+scope（看） -> （潜望镜伸出水面）看周围的情况 -> 潜望镜

Webster Collegiate

noun

• Etymology: International Scientific Vocabulary
• Date: 1879
• a tubular optical instrument containing lenses and mirrors by which an observer obtains an otherwise obstructed field of view

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