博比使劲拽了她头发一下.用英语怎么说？

博比使劲拽了她头发一下.

Bobby gave her hair a tug.

bobby

n. <英俚>警察；

例句
These days, the bobby on the beat is a rare sight.
现在很少能看到巡逻的警察。

gave

v. 给予，赠送( give的过去式 )，（与名词连用描述某一动作，意义与该名词相应的动词相同），供给，交给；

例句
He gave a detailed account of what happened on the fateful night...
他详细描述了那个灾难性夜晚所发生的事。

her

pron. (she的宾格)她，(she的所有格)她的，她，指某个国家，（一艘）船；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

hair

n. 头发，毛发，（动、植物的）毛，一丝丝，些微，毛发织物；

例句
The wind pushed his hair across his face.
他的发丝随风拂面。

tug

vt.& vi. 用力拉，使劲拉，使劲，挣扎，[航海]用拖船拖曳，竞争；n. 猛拉，推力，绳索链条，[航海] 拖船，竞争，斗争；

例句
The tug was seaward of the Hakai Passage on a course that diverged from the Calvert Island coastline.
托船驶离卡尔弗特岛海岸朝哈凯航道驶去。