题目内容
n. a tissue graft or organ transplantation from a donor of different species from the recipient. (x_______)
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n. the transparent layer which covers and protects the outer part of the eye. (c______)
adj. located towards the center of the body or near to point of attachment or origin. (p______)
n. either of two bean-shaped organs that filter wastes (especially urea) from the blood and excrete them and water in urine. (k_____)
骨的构造包括 ( )
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