The pigeonhole principle states that if more than n pigeons are placed into n pigeonholes, some pigeonhole must contain more than one pigeon.
鸽子洞原理认为，如果有超过n只鸽子要放入n个鸽子洞中，有一些鸽子洞就要装进2个以上的鸽子。
Pigeon pea: cover crop suited to human and animal nutrition, pest and disease control, N fixation and P disponibility.
豌豆是人类和动物的营养物，作为覆盖作物有效控制病虫害，固定氮素。
Pigeon pea: cover crop suited to human and animal nutrition, pest and disease control, N fixation and P disponibility.
豌豆是人类和动物的营养物，作为覆盖作物有效控制病虫害，固定氮素。
应用推荐