This article analyzes reasons for constant troubles in operation, puts forward trouble- shooting methods, and introduces corresponding normal maintenance.

分析了在使用过程中出现的常见故障原因，并提出了解决办法，介绍了日常使用时的正常维护与保养。

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Two troubles in the operation of S-520 scan electron microscope are analyzed and the related circuits are described. The curing methods are explained in detail.

介绍了S-520型扫描电镜实际操作中出现的两种故障现象。对相关电路进行了简要分析。详细说明了故障的排除方法。

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The hydraulic impact is one of common troubles in hydraulic system. It endamages seriously the normal operation and reliability of the hydraulic system.

液压冲击是液压系统的常见故障之一，对液压系统的正常工作和可靠性，具有严重的危害。

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But Mr Zardari's shift of the government's stance will have to be subtle, not least because economic troubles loom and America has offered more financial inducements in return for co-operation.

ECONOMIST: Pakistan's tribal areas