Tests with a trained seal have revealed that the animals can sense underwater objects, even with their hearing and sight restricted.
对训练过的海豹实验已发现，即使封闭了他们的听觉和视觉，它们也可以感知水下的物体。
Their large nostrils completely seal for underwater travel.
他们的鼻孔很大，在潜水时会完全闭合。
The seal technology studied in this paper is to make use of a certain physical rule, some technology and devices to get some local environment, which is needed by underwater micro-robot.
本文所讨论的密封问题是指：利用一种物理规律，通过某种技术和装置，实现微小型水下机器人需要的局部环境，水密性研究也是微小型水下机器人的一项非常关键的技术。
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