As long as you had the right form at the bottom of your cylinder, getting the densest possible pack would be a cinch.
只要圆柱体的底层排列正确，包装紧密就是容易的事情了。
2
FIG. 2 Internal Cylinder Configuration, top. Overhead view of low pressure liquid withdraw, bottom left. Overhead view of liquid and high pressure gas with-draw, bottom right.
图2上面是钢瓶的内部结构，左下是低压液体提取装置的俯视图，右下是液体和高压气体提取装置的俯视图。
3
Working principle: piston moves from left to right, form a negative pressure pump cylinder, the liquid tank into the pump by the inhalation valve cylinder.