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（尤指机器出现不明故障时人们假想出来的捣乱的）小妖精
A gremlin is a tiny imaginary evil spirit that people say is the cause of a problem, especially in a machine, which they cannot explain properly or locate.
例句
The microphones went dead as if the technical gremlins had struck again.
麦克风没有了声音，似乎小妖怪又把设备弄坏了。