Like magic out of a Harry Potter novel, such a metal could contract on command, or swing back and forth like a pendulum.

像这种仿佛出自《哈利·波特》小说中的魔法一般的金属可以按照指令收缩，或者像钟摆那样前后摇摆。

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It points out the difference between the traditional model and improved model and some problems during the execution of the Buy-back contract. It further makes Suggestions for improvement.

通过对比指出了改进的模型和传统回购合同的区别以及回购合同在执行中存在的问题并提出改进方案。

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The Gunners are short of experienced cover at the back, having seen out-of-contract veterans William Gallas, Sol Campbell and mikael Silvestre leave this summer.

随着加拉、坎贝尔以及西尔维斯特今年夏天的离开，枪手后防缺乏足够的经验保障。

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Both winger Whittingham and centre-back Johnson are out of contract next season but signing improved deals at Ninian Park will certainly fend off interested admirers.

BBC: Cardiff stars set for new deals

Centre-back Youl Mawene, who is also out of contract in June, is set to discuss his future soon.

BBC: Manchester United's Danny Welbeck ponders Preston move

General Manager Brian Cashman was ready to let A-Rod leave when he opted out of his prior contract back in 2007, only to be overruled by the caving Hank Steinbrenner.

FORBES: Ibanez Hits For A-Rod: Great Now, Troubling For The Yankees' Future