舌门 meaning in Chinese

flapper
ram door
shitakado

One of those boys , who loved to play with his companions , observed that , by tying a string from the handle of the valve which opened this communication to another part of the machine , the valve would open and shut without his assistance , and leave him at liberty to divert himself with his playfellows
有一次担任这工作的某儿童，因为爱和朋友游玩，他用一条绳把开闭通路的舌门的把手，系在机械的另一部分，舌门就可不需人力自行开闭。