一些家长担心这样会鼓励他们的孩子乱扔垃圾，因为这样他们就可以看到鸟儿捡垃圾了。
Some parents are concerned that it encourages their children to drop litter so they can watch the birds pick it up.
然而，一些家长担心这样会鼓励他们的孩子乱扔垃圾，这样他们就可以看到鸟儿捡垃圾了。
However, some parents are concerned that it encourages their children to drop litter so they can watch the birds pick it up.
一些家长也很担心，比如32岁的瓦妮莎·霍尔本，她有两个不到4岁的女儿。
Some parents are worried too for example, Vanessa Holburn, thirty two, who has two girls under the age of four.
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