名词
中文翻译：直线运动
同义词：
['main motion', 'straight-line motion']
例句：
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1.The car is moving straight and fast along the road.
汽车沿着道路直直地快速行驶。
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2.The team's main motion was to win the championship.
队伍的主要运动是赢得冠军。
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3.The runner made a straight main motion towards the finish line.
跑步者朝着终点线直直地迈出了第一步。