词An avocet has a long, strongly upcurved bill which contains a complex and highly specialized system of lamellae capable of filtering out small food items.
我找了一下网路上
资料，似乎也没有讨论他嘴上弯原因文献，可能有很久以前，
太好找了。
An avocet has a long, strongly upcurved bill which contains a complex and highly specialized system of lamellae capable of filtering out small food items.
我找了一下网路上资料，似乎也没有讨论他嘴上弯原因文献，可能有很久以前，太好找了。
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