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判断题
This kind of plane cannot be built unless we find a metal even lighter than this high-strength aluminum alloy.
This kind of plane cannot be built unless we find a metal even lighter than this high-strength aluminum alloy.
我们不可能造出这种飞机来，除非我们找到一种比这种高强度的铝合金更轻的金属。
答案：
正确
