It is the sound of workers cutting through all of the re-bar to pour the foundation for the apartment house being built next door but striking it with a small hammer, repeatedly, until it breaks.
隔壁正在兴建的公寓，一群建筑工人正在切割修建地基所用的钢筋，不过是用一把小铁锤不断地锤打，直到钢筋断裂。
Given that a 747 or 777 is built around an aluminum frame, how difficult would it be and how much weight would be saved by "re-skinning" with the same material that is being used for the 787?
既然是747或777，是围绕着一个铝框，是多么困难，将它多少的重量，将所节省的“再剥皮”，以同样的材料正被用于787吗？
Given that a 747 or 777 is built around an aluminum frame, how difficult would it be and how much weight would be saved by "re-skinning" with the same material that is being used for the 787?
既然是747或777，是围绕着一个铝框，是多么困难，将它多少的重量，将所节省的“再剥皮”，以同样的材料正被用于787吗？
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