survival bag的意思|示意

The ballonet inside the survival pack can be aerated and placed into the bag to postpone the sink time of the survival pack, so as to help a drowned person catch the survival pack.

救 生包内小气球使用时，吹大来放入袋子中，可延缓救生包下沉的时间，以利 于溺水者抓住；

It's very interesting to understand... When I teach a survival class, one of the things I do is, right at the beginning of the class I put a velvet bag over people's head.

这理解起来很有趣…当我教授生存课程时，我做的事情之一就是，在这节课之初，我就把丝绒袋放在每个人的头上。