New words：

spring [spriŋ]
v.跳；跃；蹦；突然猛烈地移动
n.春天；弹簧；发条；跳

sprang [spræŋ] 过去式
sprung [sprʌŋ] 过去分词

Sample Sentences：

There's little spring in this sofa.
The cat made a spring at the mouse.

The dog tried to spring over the gate.
Suddenly a rabbit sprang out of its cave.
He turned off the alarm and sprang out of bed.

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