It's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddlewheel.
这是一个很简单的问题，通过观察重量是多少以及它下降了多远，来确定桨轮做了多少功。
So, it's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddle wheel.
好，让我们看看重物的质量,以及它下落的距离，就知道桨轮做了多少功。
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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