Since sheep and cattle can't survive harsh climates, they needed to be taken south every winter.
由于牛羊不能在恶劣的气候条件下生存,每年冬天都要把它们带到南方去。
It had become an issue since the cloning of Dolly the sheep in Scotland.
自苏格兰的多利羊被克隆后,这已成为一个争议性问题。
Ever since Dolly the sheep was cloned in 1997, Westhusin's phone has been ringing with people calling in hopes of duplicating their cats and dogs, cattle and horses.
自从1997年多利羊被克隆以来,威斯苏森的电话一直响个不停,人们打电话希望能复制他们的猫、狗、牛和马。
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