In vitro fertilization (IVF)
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释义：
Clinical procedure for achieving fertilization when it cannot be accomplished naturally; an oocyte (immature ovum) is removed, fertilized in the laboratory, and placed as a zygote into the uterus or fallopian tube (ZIFT, zygote intrafallopian transfer); alternatively, an ovum can be removed and placed along with sperm cells into the fallopian tube (GIFT, gamete intrafallopian transfer) (see BOX 16-4)