The cardinal includes 1, 2, 3, etc.

基数词包括1、2、3等等。

With the addition of the toes on our feet a vigesimal (base 20) number system, like that of the Maya, also makes sense.

再加上我们的双脚的脚趾，二十进位（以20为基数）数字体系也是合合理的。