n.被加数
As described at full belly project.org, the universal nut Sheller is basically a summand (cement) corn (cone) with in a corn (cone). 正如温饱计划网站上的描述，通用坚果脱壳器是一个水泥圆锥体中套一个圆锥体。
Strong law of large number for the summand method 可和方式的强大数定律
Hereditariness of Direct Sum Decomposition to Direct Summand 直和分解对直和项的遗传性
direct summand 直接被加数
