顶柱 meaning in English

head pin
jack-prop

Application of room - pillar method with artificial roof support in dongbaoshan mine
人工顶柱房柱法在东宝山矿区的应用
Because of its small size , a motorcycle can be easily hidden in a car ' s blind spots ( door / roof pillars ) or masked by objects or backgrounds outside a car ( bushes , fences , bridges , etc )
因为较小的尺寸，机车可以轻易的隐藏在汽车的视觉死角(门柱车顶柱等)或是被其他物件遮盖(树丛、栅栏、桥梁等等) 。