We studied water permeability of seed coat , development of embroy , absence or presence of germination inhibitors and some other aspects in order to confirm the dormany causes of mulberry seeds from north of heilongjiang province 摘要从种皮透性、胚的发育、是否存在萌发抑制物等方面，对产于黑龙江省的实生桑种子休眠原因进行了研究，初步认为，胚的生理性休眠是实生桑种子休眠的主要原因。
But when we are using our higher brain to work hard for society and humankind , the body secretes endorphins continuously with no counteracting substance . therefore , the more we help others , the more happy and healthy we are and our subconscious abilities become more developed 但当我们运用高级脑大脑的一部分为社会人类尽心尽力时，体内会不断分泌脑内吗啡，但却没有任何抑制物的产生，因此我们越帮助别人会越快乐健康，自我的潜能也更加发展。
