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jiǎn dān de qián wàng jìng shǐ yòng píng miàn jìng
简单的潜望镜使用平面镜。
A simple periscope uses mirrors.
tā bèi hòu de qián wàng jìng tū rán mào le chū lái
他背后的潜望镜突然冒了出来。
The periscope bobbed up behind him.
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