jumping jack
复数形式
jumping jacks
1
开合跳, 跳跃杰克
an exercise that is performed by jumping from a standing position with legs both spread wide and the hands touching overhead and then returning to a position with the feet together and the arms at the sides
- The warm-up routine began with a set of jumping jacks to get everyone's heart rates up.
热身程序从一组开合跳开始，以提高每个人的心率。
- She did a series of jumping jacks before starting her workout to loosen up her muscles.
她在开始锻炼前做了一系列开合跳来放松肌肉。
- The fitness instructor demonstrated how to perform jumping jacks correctly for maximum benefit.
健身教练演示了如何正确进行开合跳以获得最大收益。
- To increase the intensity of the exercise, he added jumping jacks between other cardio drills.
为了增加运动的强度，他在其他有氧运动之间加入了开合跳。
- The children enjoyed doing jumping jacks during their physical education class, making it a fun activity.
孩子们在体育课上喜欢做开合跳，使其成为一项有趣的活动。
2
a toy figure with movable joints that can be made to dance or move by pulling attached strings
A jumping jack is a type of toy that consists of a figure with moveable limbs, often made from wood or plastic, attached to strings. When the strings are pulled, the figure's arms and legs move in a jumping motion. The toy is often designed to look like a person or animal, with the action of the limbs creating a playful, lively effect. Jumping jacks have been popular for many years, especially as a traditional toy for children. They are enjoyed for their simple mechanics and ability to entertain with their repetitive, bouncy movement.