一触点在断开或闭合时造成的一种不希望产生的断断续续的连接状态。 An unwanted making and breaking of the connection while opening or closing a contact.
（先天性）闭锁〓，无孔正常的身体孔或管道┃，如肛门‖、肠或外耳道的缺失或闭合 The absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
