请问老师：

  The company around the table watched Voldemort apprehensively, each of them, by his or her expression, afraid that they might be blamed for Harry Potter’s continued existence. Voldemort, however, seemed to be speaking more to himself than to any of them,still addressing the unconscious body above him.

“I have been careless, and so have been thwarted by luck and chance, those wreckers of all but the best-laid plans. But I know bet ter now. I understand those things that I did not understand before.I must be the one to kill Harry Potter, and I shall be.”

加粗的句子怎么翻译？

书本给出的翻译是：我太大意了，所以被运气及偶然因素所挫败，只有最周密的计划才不会被这些东西破坏。 总觉得翻译和原文对不上，还请老师解惑。

“I have been careless, and so have been thwarted by luck and chance, those wreckers of all but the best-laid plans.

参考译文：我一直都很粗心大意，运气也不佳，尽管计划周密，却一再受挫。

请老师帮忙分析一下这个部分：

those wreckers of all but the best-laid plans=那些毁灭几乎完美计划的东西（即指的是前面提到的运气和机会）。

(2017年12月2日继续跟踪回答如下）

those wreckers of all but the best-laid plans 为前面名词短语同位语luck and chance.

A:all but =几乎， 差不多；除了…之外（都）

(1)几乎, 差不多 

She all but fainted when she heard the news. 

听到那消息, 她差点晕过去。 

(2)除了…之外(都) 

All but one of the passengers were killed in the accident. 

除了一个乘客外, 其他人都在这起事故中丧生。

B:wrecker n. 使船失事的人，肇事者，失事现场清理人

C:wreck vt. 破坏，毁坏；拆除；使遇难

wrecker of sth 属于动宾关系“即某事的毁灭者/毁坏者/损坏者

wrecker of all but the best-laid plans.几乎完美计划的毁坏者/毁灭者。

D:best-laid  adj.最周密的，最完美的

(1)vt.毁掉;毁坏;损坏

He wrecked the garden.

他毁掉了花园。

A coalition could have defeated the government and wrecked the treaty.

联盟本来可以击败政府并毁掉该条约的。

His life has been wrecked by the tragedy. 

他的生活被这场灾难毁掉了。

missed promotions, lost jobs, wrecked marriages. 

错过的提升机会，失去的工作，破裂的婚姻

(2)vt.使(船舶)失事；使遇难

The ship was wrecked by an explosion. 

这艘船被炸毁了。

a wrecked cargo ship. 失事的货船