问题描述：
heavy与weight
原句：How heavy is that piece of luggage?（改为同义句)
What's the weight of that piece of luggage?
为什么用what' the weihgt 不用what's the heavy?
原句：How heavy is that piece of luggage?（改为同义句)
What's the weight of that piece of luggage?
为什么用what' the weihgt 不用what's the heavy?
问题解答：
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