词汇 | bounce up and down |
释义 | bounce up and downTo hop up and down. The kids started bouncing up and down when they heard school was closed for the day. bounce up and downto spring up and down due to natural elasticity or from being jostled or thrown. The ball bounced up and down for an amazingly long time. I bounced up and down in the back of that truck for almost an hour. |
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