bollard light安全岛指示灯
bitt bollard带缆桩
single bollard单柱系缆桩
fixed bollard固定系船柱
berthing bollard靠泊系船柱
free bollard活动系船柱
Pull bollard系船柱拉力
bollard d系船栓;护柱;矮柱
N-COUNT（可数名词） Bollards are strong wooden or metal posts on the side of a river or harbour. Boats are tied to them. 系船柱