汉语看不出来区别，仔细看英文就知道区别了： fetation [fi:ˈteɪʃən] or foetation n 1) the state of pregnancy 2) the process of development of a fetus fe·ta·tion or chiefly Brit foe·ta·tion fē-ˈtā-shən n : the formation of a fetus : PREGNANCY pregnancy noun (plural pregnancies) the state of being pregnant: Many women experience sickness during pregnancy. ◆ a pregnancy test ◆ unplanned / unwanted pregnancies ◆ the increase in teenage pregnancies pregnancy [ˈprεgnənsɪ] n, pl -cies 1) the state or condition of being pregnant 2) the period from conception to childbirth conception / kənˈsepʃn; kənˋsɛpʃən/ n conceiving (conceive 1) or being conceived 怀孕; 受孕: the moment of conception 受孕的一刻 * an unplanned conception 计划外怀孕. (a) thinking of (an idea or a plan) （主意或计划的）构思, 构想, 设想: The plan, brilliant in its conception, failed because of inadequate preparation. 那计划的构想狗化倒是十分宏伟, 但终因准备不匪躬耗足而告吹. (b) ~ (of sb/sth/that...) idea, plan or intention 主意; 计划; 意图: The new play is a brilliant conception. 这出新剧真了不起. * I have no conception of (ie do not know) what you mean. 我完全不懂你的意思. conception noun the process of forming an idea or a plan: The plan was brilliant in its conception but failed because of lack of money. ~ (of sth) ~ (that ...) an understanding or a belief of what sth is or what sth should be: Marx's conception of social justice ◆ He has no conception of how difficult life is if you're unemployed. the process of an egg being FERTILIZED inside a woman's body so that she becomes pregnant: the moment of conception ◆ A child is born about 40 weeks after conception takes place. conception [kənˈsεpʃ宰队ən] n 1) something conceived; notion, idea, design, or plan 2) the description under which someone considers something her conception of freedom is wrong 3) the fertilization of an ovum by a sperm in the Fallopian tube followed by implantation in the womb 4) origin or beginning from its conception the plan was a failure 5) the act or power of forming notions; invention •