jumping jack
US /ˈdʒʌmpɪŋ dʒæk/
UK /ˈdʒʌmpɪŋ dʒæk/

名詞
1.
開合跳
an exercise in which you stand with your feet together and your arms at your sides, then jump to a position with your legs spread wide and your arms extended overhead, and then return to the starting position
範例:
•
We started our workout with 20 jumping jacks.
我們以20個開合跳開始鍛鍊。
•
Doing jumping jacks is a good way to warm up.
做開合跳是很好的熱身方式。
在 Lingoland 學習這個單詞