He caught his coat on a nail projecting from the wall.
他的外套被墙上的一颗铁钉钩住了。
An upper section, often with a sloping floor, projecting from the rear or side walls of a theater or an auditorium to provide additional seating.
边座，楼座剧院或大礼堂中为了增加座席，而从后面或侧墙突出的具有倾斜地板的上面部分
A projecting cam, as on a rotating shaft, that activates another machine part.
凸轮如转轴上突出的挺杆，使另一个机器零件活动
