From picture of axle center trail judging the sign of early stage of vibration and preventing fault worsens of revolving machine is feasible.

从轴心轨迹图上判断出振动的前期征兆，对防止故障的恶化和排除故障具有指导作用。

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CONCORD, New Hampshire (CNN) -- Checking in from the New Hampshire campaign trail, Democrats running for president were quick to find fault with President Bush's State of the Union address Tuesday night.

CNN: Candidates question Bush's State of the Union