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崖沙燕是一种腹部为白色的褐色的鸟。

The sand martin is a brown bird with white underneath.

《柯林斯英汉双解大词典》

比如，有着长长翅膀的鸟形风筝就是北京风筝的一种特殊类型。

For example, the bird-shaped kite with long wings is a special kind of the Beijing kite.

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