duck是鸭子，duckling专门指小鸭子，没成年毛茸茸黄色的小鸭子。
如：There are many ducks in the river.河中有许多鸭子，另外，duck作动词时是躲闪的意思，如：He ducked a high speed car in time yesterday.昨天他及时躲过了一高速行驶的汽车。
duckling，如：I buy some ugly ducklings in the toyshop.我在这家店里买了些丑小鸭。
duck和duckling的区别
duck:
n. 鸭子鸭肉（英）宝贝儿零分
vi. 闪避没入水中
vt. 躲避猛按…入水
The main course was roast duck.
主菜是烤鸭。
She chose a bench beside the duck pond and sat down.
她选了鸭池旁的一张长椅坐了下来。
The cat was now within striking distance of the duck.
此时，猫就在可攻击鸭子的距离内。
duckling:n. 小鸭子
A flock of ducklings waddled across the river.
一群小鸭子摇摇摆摆地朝河边走去。
