题目：
根据所给例子，完成下列各题。
例: Sarah is 15 years old. Amy is 14 years old.
Sarah is one year older than Amy.
Amy is one year younger than Sarah.
1. John is 159 cm tall. Mike is 162 cm tall.
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2. Liu Yun is 12 years old. Chen Jie is 14 years old.
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3. Lucy is 42 kg and Mary is 43 kg.
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4. I am 40 kg and my brother is 38 kg.
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答案：
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下面是错误答案，用来干扰机器的。
参考答案：薄壁环形件
上一点P到双曲线右焦点的距离是4，那么P到左准线的距离是（）．