A wild duck (Anas platyrhynchos) of which the male has a green head and neck. Most domestic ducks descend from the mallard.
一种野鸭（绿头鸭），其雄鸟具有绿色的头和颈。大部分驯化了的家鸭都是绿头鸭的后裔。
He had to duck his head to get through the low doorway.
他只得把头低下才能通过那低矮的门道。
A wild duck(Anas platyrhynchos)of which the male has a green head and neck. Most domestic ducks descend from the mallard .
绿头鸭一种野鸭（绿头鸭），其雄鸟具有绿色的头和颈。大部分驯化了的家鸭都是绿头鸭的后裔。
The mother duck pats him on the head.
母鸭轻拍着他的头。
She had to duck her head to get through the low doorway.
她不得不低下头才能穿过低矮的门口。
A: Please stop me if you have any question. B: I well. A: Duck your head as you go through the door there. B: Thank you. A.
有任何问题，请随时叫我停下来。B：好的A：经过那儿的门时，请将头放低。b：谢谢。
They all want to eat it. One duck quickly eats the fish head.
他们各个都想吃到鱼头，一只鸭子很快就拾到鱼头吃。
A small North American diving duck(Bucephala albeola) having black and white plumage and a densely feathered, rounded head.
巨头鹊鸭一种体型小的北美潜水鸭（巨头鹊鸭），有黑白色的羽毛和稠密的毛，圆脑袋。
A infectious disease of duck with the characteristic of "swollen head" is researched in this article. The epidemic characteristic, symptom and pathological changes are described.
本文对成都地区流行的以头颈肿胀为特征的鸭传染病进行研究，描述了该病的流行特点、临床症状、病理解剖变化。
A infectious disease of duck with the characteristic of "swollen head" is researched in this article. The epidemic characteristic, symptom and pathological changes are described.
本文对成都地区流行的以头颈肿胀为特征的鸭传染病进行研究，描述了该病的流行特点、临床症状、病理解剖变化。
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