名词
中文翻译：自发运动
同义词：
['natural movement', "spontaneous motion例句：1. The animal's spontaneous movement caught the observer off guard.（动物的自发运动让观察者措手不及。）"]
例句：
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1. The animal's spontaneous movement caught the observer off guard.
动物的自发运动让观察者措手不及。
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2.The scientist observed the spontaneous movement of the planets around the sun.
科学家观察到了行星围绕太阳的自发运动。
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3.The child's natural movement was so graceful that it made everyone smile.
孩子的自然运动如此优雅，让每个人都笑了。