吴嘉丽郎心如铁:英语高手请帮忙翻译、解释一小段电影对话

A：You don't understand.
你不明白的
B：Who could understand better than me?
还有人比我知道的更多啊？
A：It's so shameful.
这太丢人了
B：Whatever it is, Brooke, it could save you.
不管是怎样，BROOKE，它能挽救你。
A：That's just it. It would ruin me.
仅此而已，但它却会毁了我一生。
B：How?
怎么？
A：I've made my fortune on the ability...to perfect women's bodies with Butt-Buster workout.
我是通过这个能力赚钱的，。。。就是用Butt-Buster让女人的身体变的完美。
B：You helped me go from a six to a four.That's great!
真要谢谢你，你把我腰围从6缩细到了4。

A：On the day of Heyworth's murder...I was getting...
在Heyworth被谋杀的哪天。。我正。。。
B：What?
正在干什么？

A：I was getting liposuction.Liposuction!
我在做抽脂，就是抽脂！
B：Oh, God!
哦，老天！
A：I know! I'm a fraud! It's not like normal women can have this ass!If my fans knew that I bought it...I would lose everything! I've already lost my husband.I'd rather go to jail than lose my reputation.
我知道，我是骗子 ，普通女人的臀部哪会着样，如果我的歌迷知道我是动了手术。。。我就会失去一切！我已经失去了我丈夫，我宁愿去坐牢也不愿意失去名誉。

B：Brooke... your secret's safe with me.
BROOKE，我会保守你的秘密的。
A：Thank you.
谢谢！

问题：

1.A：I've made my fortune on the ability...to perfect women's bodies with Butt-Buster workout.

B：You helped me go from a six to a four.That's great!

Butt-Buster workout是种什么东西？
from a six to a four指什么？

可能是一种健身运动，由于她做了抽脂，所以身材很好，但她的学员可能以为是天生的。所以她不愿意让别人知道。

Liposuction是什么东西？为什么让她觉得shameful？
抽脂手术。