水兵们通过潜望镜观察海面上的情况。
The sailors used the ___periscope to check the situation on the sea surface.
潜艇指挥官通过潜望镜观察海面情况。
The submarine captain observed the sea surface through the ___periscopes.
士兵通过潜望镜观察战场上的敌军动向。
The soldier used a ___periscope to monitor enemy movements on the battlefield.
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