玩具气球，海绵及铜簧是有弹性的。
也许用玩具气球的情况最容易说明这种反作用力。
It is perhaps easiest to understand the reaction in the case of the toy balloon.
本实用新型公开了一种自动充气玩具气球，属于文体用品技术领域。
The utility model discloses an automatic inflatable toy balloon, which belongs to the technical field of stationery and sport goods and comprises an air chamber.
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