有些网站不允许一定年龄以下的孩子访问。
Some websites don't allow kids under a certain age to visit them.
把一定年龄以下的孩子单独留在家里，是错误的、危险的。
It's wrong and dangerous to leave children under a certain age alone in the house.
一些学者得出结论，资源有限的政府应该停止为超过一定年龄的人（比如83岁左右）支付医疗费用。
Some scholars conclude that a government with finite resources should simply stop paying for medical care that sustains life beyond a certain age—say 83 or so.
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