The cat was now within striking distance of the duck.
此时，猫就在可攻击鸭子的距离内。
Ducks were swimming around on the river.
鸭子在河面上游来游去。
We ducked down behind the wall so they wouldn't see us.
我们弓身躲在墙后不让他们看见。
She ducked her head and got into the car.
她低着头进了汽车。
He ducked the first few blows then started to fight back.
他躲开最先几拳后便开始反击。