名词
中文翻译：速度信号
同义词：
['acceleration', 'speed up']
例句：
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1.The car was moving at a high speed signalling for the next intersection.
汽车以高速行驶，准备下一个路口。
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2. The driver had to slow down and signalling for the pedestrians.
司机不得不减速并示意行人。
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3. The pilot quickly signalling the plane to land.
飞行员迅速示意飞机降落。