| 单词 | periscope |
| 释义 | Word Frequency periscope(ˈpɛrɪˌskəʊp) noun any of a number of optical instruments that enable the user to view objects that are not in the direct line of vision, such as one in a submarine for looking above the surface of the water. They have a system of mirrors or prisms to reflect the light and often contain focusing lenses Word origin C19: from Greek periskopein to look around; see peri-, -scope |
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