" You know it by heart, we can just ask you."

“反正你已经记得滚瓜烂，我们问问你就可以了。”

It was like a perfectly delivered line by a skilled actor.

他的话就像个炉火纯青的演员背得滚瓜烂的词。

" I know every word of it, I tell you, " said Eustacia decisively.

“跟你吧，我对这出戏记得滚瓜烂，”游苔莎果断地。

You'll notice that once you do this transition over and over again, then in the words, it's like easy peasy.

你会注意到旦你把这种转换练得滚瓜烂，在单词中，对你来就是小菜碟了。

Should you have the opportunity to take part in a school drama one day, you will probably try to memorize your lines to perfection.

万有天你有机会参与学校话剧的演出， 你可能会设法将词背得滚瓜烂。

" Well, Barty knows the rule book back to front, " said Bagman, beaming and turning back to Karkaroff and Madame Maxime, as though the matter was now closed.

“嘿，巴蒂把章程背得滚瓜烂。”巴格曼，脸上绽开笑容，回过头来望着卡卡洛夫和马克西姆夫人，似乎事情已经圆满解决了。

She still really knew them, if she troubled to think: but she was no longer so " pat" in her lesson as to be sure of reeling them off in the right order at a moment's notice and without thinking.

要是她肯费心想想，她其实还是知道的，但她对自己的功课已不再背得滚瓜烂，遇到人家问，未能不假思索字不差地背出来。