Periscope: An instrument that has angled mirrors or prisms and allows objects not in the direct line of sight, to be seen. It is often used on submarines and in the military.
👇 ស្វែងរកឯកសាររៀននិងការងារគ្រប់ប្រភេទនៅទីនេះ៖
👇 ស្វែងរកពាក្យផ្សេងទៀតនៅប្រអប់នេះ៖