There are two advantages for ladder-type aluminum container, one is enhancing containers rigidness, another is making the ladders become the more the nice-looking after anode oxygenation coloring up.

• 阶梯形铝器皿有二个优点:一是增加器皿的刚度;二是经过阳极氧化着色之后阶梯越多越美观。