1. He threw a summersault on the bed.
他在床上翻了一个筋斗。
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2. The skillful bikers can even summersault in air.
在熟练的骑手，甚至可以俯冲在空气中。
noun
1. summersault
1. an acrobatic feat in which the feet roll over the head (either forward or backward) and return
Synonym: somersault somerset summerset somersaulting flip