来英语达人Physically,it consisted of a silicon chip in a pretecti

来英语达人
Physically,it consisted of a silicon chip in a pretective ceramic capsule,with a set of metal pins sticking out that connected it to other components in whatever device it controlled.主要是with a set of metal pins sticking out that connected it to other components in whatever device it controlled.这句话.components 后面为何要加个in呢!