Pattern: Used to specify the message exchange pattern (MEP) for the operation.
pattern：用于指定该操作的消息交换模式(message exchange pattern,mep)。
Each operation is a message exchange.
每个作业都是讯息交换。
The button on the panel, can exchange the operation for car tyres and truck tyres.
操作面板上配备大、小车转换按键，可轻松平衡各式轮胎。
The button on the panel, can exchange the operation for car tyres and truck tyres.
操作面板上配备大、小车转换按键，可轻松平衡各式轮胎。
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