n.分泌乳汁；授乳；哺乳
Lactation is the final phase of the reproductive cycle of mammals. 泌乳是哺乳动物繁殖周期的最后阶段。
Amazingly little is known about human lactation or nursing. 对人类哺育婴儿或哺乳所知甚少。
n.断奶
