Arranging your padding parallel to a wall rather than diagonally or haphazardly will help you Orient yourself once you're upside down.
将你的垫子或者毯子放置的与墙壁平行，而不要斜着或者随便一放，待会你大头朝下之后才更容易找到方向感。
2
When using padding, anchor the pillow down with a sand bag or a non-reflecting heavy object so it doesn't move.
当使用填充物的时候，要用沙袋或者不会有声反射的重物把它压着，这样它就不会移动。
3
Down stream anaerobic biological filter where waste-water poured from top was used as anaerobic processing device in which bacteria colloid was found on padding in biological membrane form.