名词短语
中文翻译：直接视线系统
同义词：
['Direct Eye System (DES)，Direct Viewing System (DVS)']
例句：
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1. The director-sight system is a critical component of the spacecraft's navigation system.
直接视线系统是航天器导航系统的关键环节。
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2.The DES allows astronauts to view their surroundings in real-time, providing them with immediate feedback.
直接视线系统允许宇航员实时查看周围环境，并提供即时反馈。
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3. In the DVS, the camera lens is mounted directly on the spacecraft's nose, allowing for close-up views of the Earth from orbit.
在直接视线系统中，镜头直接安装在航天器的鼻部，使从轨道上近距离观察地球成为可能。