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n.(Rack)人名；(法、德、意、匈)拉克
vi.变形；随风飘；小步跑
n.[机]齿条；架子；拷问台
vt.折磨；榨取
1、fracked───锁定
2、tracked───adj.有履带的；v.[计][电子]跟踪，追踪（track的过去式）
3、arcked───弧形的
4、cacked───咯咯叫
5、wracked───v.使痛苦不堪，使受折磨（同rack）；n.海藻类植物；行云团，高空碎云；遇事船，失事船只的残骸；PoHuai
6、dacked───被撞的
7、backed───adj.有背的；有财力支持的；v.支持；使后退（back的过去分词）
8、cracked───adj.破裂的；（声音）嘶哑的；（非正式）精神失常的，发疯的；v.破裂；砸开；猛击；崩溃；（嗓音）变嘶哑（crack的过去式和过去分词）
9、-acked───已确认
1、She racked her brains, trying to remember exactly what she had said.───她绞尽脑汁，想要回忆起她到底说过些什么话。
2、RSS racked up quite a bit of support from the executives, coming in third after blogs and video sharing sites.───RSS得到了高管们的强力支持，受欢迎程度屈居博客和视频分享网站之后位列第三。
3、Convulsive sobs racked her body.───她的抽泣晃动着整个身子。
4、Mr. Hu and his successors are sure to be racked by the question of how fast China can sustainably grow.───HuZhuXi和他的JieBan人肯定会为如何保持中国持续快速增长的势头而大伤脑筋。
5、She walked back and forth on the path. She has racked her brain. But she did not seem to pay attention to.───她在小路上来回走着。她已经绞尽了脑汁。但她好象还是没注意。
6、He racked his brains for an essay, but he wasn't able to think of a single word.───他冥思苦想他的论文，却连一个字都想不出来。
7、Last night I racked my brain trying to think of something that I do that impresses Dad, so I could build on it.───昨晚我绞尽脑汁想如何做出一些能给爸爸留下深刻印象的事情来，这样我就可以在此基础上扩大战果了！
8、Her face was racked with pain.───她满脸的痛苦。
9、Porsche racked up more than $12 billion in debt trying to takeover VW, leaving the company with a rather large $3. 5 billion cash shortfall.───保时捷累积超过120亿美元的债务试图收购大众，离开公司的一个相当大三十五万点零零万美元现金短缺。
1、They racked up 25 points in the first half.
2、Bush has racked up victories in another five states.
3、The pain racked him.
4、He racked all the bottles of wine after dinner.
5、A toothache racked my jaw.
6、A coughing fit racked her whole body.
7、He was too racked by sobs to reply.
8、He has racked up 450 points in three months.
9、He racked off a miserable story.