The central meaning shared by these verbs is . to swing back and forth boldly and dramatically.
这些动词所共有的中心意思是。大胆而有戏剧性的前后摆动。
Like magic out of a Harry Potter novel, such a metal could contract on command, or swing back and forth like a pendulum.
像这种仿佛出自《哈利·波特》小说中的魔法一般的金属可以按照指令收缩,或者像钟摆那样前后摇摆。
The motor drives a gear at the top of the tail, causing the tail to swing back and forth, which propels the robot upward.
发动机带动机器人尾巴顶部的齿轮,引导尾巴前后摇摆,推动其上升。
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