he has three rules
他有三条规则
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"Downton Abbey" centers on a British aristocrat, Robert Crawley, the Earl of Grantham, who has three daughters but no sons to whom he can leave his estate, as required under British property rules at the time.
WSJ: Money Lessons From 'Downton Abbey'
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