同义替换　rotation n. 循环 cycle n. 循环 propagation n. 传播；繁殖 diffusion n. 传播；扩散
mortgage [?m??g?d?] n.抵押，抵押借款v.抵押
例句　The house was mortgaged to the bank for fifty thousand dollars.这所房子抵押给银行借得五万美元。
翻译　She brought me word they had no such sum to spare; I said they might mortgage their house in the loan office（把房子抵押给店铺）.
cognitive [?k?ɡn?t?v] adj. 认知的，认识的