padding- bottom

Therefore, we need to specify less padding for the top and bottom sides if we want it to be perceived as being the same.

因此，如果我们希望四边的内边距看起来是基本一致的，就需要减少顶部和底部的内边距。

The reason is that letterforms are much more straight on the sides than their top and bottom , so our eyes perceive that extra space as extra padding.

原因在于， 字母的形状在两端都比较整齐，而顶部和底部则往往参差不齐，从而导致你的眼睛把这些参差不齐的空缺部分感知为多出来的内边距。

Through a series of laboratory experiment, padding castable is considered to be good as refractory for the ladle bottom.

通过一系列实验室试验，垫补浇注料可认为是较好的罐底耐火材料。