What object has keys that open no locks, space but no room,

谜语题目：What object has keys that open no locks, space but no room, and you can enter but not go in? (什么东西有钥匙开不了锁，有空间而没有房间，你可以输入却不能进入？)
 
 
谜语解析：a keyboard （键盘）
 
 
谜语答案：a keyboard 

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