n.分泌乳汁；授乳；哺乳
Lactation is the final phase of the reproductive cycle of mammals. 泌乳是哺乳動(dòng)物繁殖周期的最后階段。
Amazingly little is known about human lactation or nursing. 對(duì)人類哺育嬰兒或哺乳所知甚少。
n.斷奶
