He saw birds come and dip their heads to drink in it and then flick their wings and fly away.
他看见鸟儿飞来，低下头来喝水，然后扇动翅膀飞走了。
2
The flick of a finger is enough to make a balloon accelerate away. When moving, it has little momentum and even the friction of the air quickly slows it up.
一根手指的弹击足够使一个气球加速离去，当气球运动时，一点动力，甚至空气的摩擦力可以很快使它慢下来。
3
Anything you need is only a flick of your tail away.