问题描述：
这句话的语法错误该怎么改?
What’s more, the babyboom appeared in 2010, the newborns in Beijingand Shanghaihave reached 10 million, and such a huge market was an opportunity forinternational brand of milk powder.
What’s more, the babyboom appeared in 2010, the newborns in Beijingand Shanghaihave reached 10 million, and such a huge market was an opportunity forinternational brand of milk powder.
问题解答：
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