生物课上，老师谈到吃虫子的鸟类，他说﹕“燕子每天需要吃跟自己的体重相等的食物。”有位学生问﹕“燕子如何知道自己的体重。”
In biology class, the teacher was discussing bug-eating birds, he said, "Swallows need to eat food the same as their own weight." a student piped up,"How do swallows know their own weight?"
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