她离开的时候他挥手告别。用英语怎么说？

她离开的时候他挥手告别。

As she receded he waved goodbye.

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

receded

v. 逐渐远离( recede的过去式和过去分词 )，向后倾斜，自原处后退或避开别人的注视，尤指问题；

例句
His hairline had receded slightly over the years.
这些年来他的前额已经有点秃了。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

waved

adj. 波浪形的，起伏的，（织物等）有波纹的；v. 飘扬，摇摆，起伏( wave的过去式和过去分词 )，（一端固定地）飘扬，挥手指引，挥动…示意；

例句
Steamers tooted at us as sailors on deck waved in amusement.
汽船向我们嘟嘟鸣笛时，甲板上的水手们饶有趣味地挥着手。

goodbye

n. 再见；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。