crownn.王冠；王权；花冠；顶点；齿冠；克朗（丹麦、瑞典、捷克等国的货币单位）vt.加冕；使 ... 成王；居 ... 之顶；镶齿冠；使圆满；<口>打…的头部crownvetch小冠花

1. There's a channel in the middle of the old street to help rainwater flow away.
   旧街道的中央有一条沟渠来排放雨水。