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来源：雅诚德英语网
Where do we find the material strong enough yet lightweight enough to act as a cable or track?
我们在哪里可以找到足够坚固且足够轻的材料来充当电缆或轨道呢？
Where do we find the material strong enough yet lightweight enough to act as a cable or track?
我们在哪里可以找到足够坚固且足够轻的材料来充当电缆或轨道呢？