Periscope

(noun.) an optical instrument that provides a view of an otherwise obstructed field.

编辑:卡蒂

• There is one fault in the periscope not easy to obviate. 佚名. 神奇的知识之书.
• As the engine is the heart of the submarine, the periscope is its eye. 佚名. 神奇的知识之书.
• The periscope is the one part of the submarine scout equipment that is open to vision from the surface. 佚名. 神奇的知识之书.

达米安校对