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A speed bump is a bump in a roadway that may be circular (圆形的), parabolic (抛物线状的), or sinusoidal (正弦曲线形的), and it may have gaps near the curb to allow drainage.
有一种可以随带随放的限速坎，看上去很有意思：
adj. 循环的，圆形的
n. 传单，通报
A speed bump (British English a road hump, sometimes colloquially a sleeping policeman) is a traffic calming tool designed to slow traffic or reduce through traffic.
A speed bump is a bump in a roadway that may be circular (圆形的), parabolic (抛物线状的), or sinusoidal (正弦曲线形的), and it may have gaps near the curb to allow drainage. 
A speed bump is a bump in a roadway that may be circular (圆形的), parabolic (抛物线状的), or sinusoidal (正弦曲线形的), and it may have gaps near the curb to allow drainage.
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