吃透英语课本,提升在校竞争力
phrase. 上上下下;前前后后
They jump up and down.
他们蹦蹦跳跳。
Ma dad started to jump up and down in their tent.
爸爸妈妈开始在他们的帐篷里跳来跳去。
During the day, he jumps up and down on his boat.
在白天,他在他的船上上下跳动。
My dad started to jump up and down in their tent.
我爸爸开始在他们的帐篷里上下跳动。
up and down
起伏;上下波动
What you do is squat up and down really fast.
你 所要做的就是真正快速地上下蹲坐。
The escalator wafts us up and down every day.
自动扶梯天天送我们上上下下。