用happens to,全句意思是“如果机器出了什么问题,请通知我.”
happen to sb/sth意思是“出了（问题）,发生（意外）”,通常指“出了意想不到的（坏）事情”.又如：An accident happened to him.他出了事故.
happen on意思是“偶然碰到,偶然发现”,例如：The two men happened on each other by chance.那两人偶然碰了面.
If anything_____the machine ,please let us know.
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