三年前，英国从美国首次进口了克隆牛的胚胎，但并无官方组织对这些克隆牛的后代进行持续检测。

Embryos from cattle cloned in the US were first imported three years ago, but no official checks have been kept on their offspring.

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贸易部长官预计本周将结束在华盛顿的会谈，此次会谈旨在修改牛肉进口协议，美国将自动禁止老龄牛出口。

His trade minister is expected to wrap up talks in Washington this week aimed at amending the beef import deal with a voluntary U.S. export ban on meat from older cattle.

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2003年，在美国发现了一头牛患有疯牛病之后，韩国宣布禁止进口美国牛肉。

Seoul banned the import of American beef in 2003, after a single U.S. animal was found to have the brain disease commonly known as "mad cow disease."

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