back of 〈美口〉 1. 在…的后面 a stream back of the house 屋后小溪 2. 作…后盾，给…撑腰 Many powerful men are back of him. 许多有权有势的人做他的后盾。 3. 作为…背后的原因 Hard work was back of his success. 他靠刻苦努力获得成功。 What's back of his proposal? 他提这建议的动机是什么? 4. 在…以前 issues of the magazine back of 1980 这份杂志1980年以前出版的各期