Performance of hydraulic oils is very dependent upon the quality of base oil to ensure good filtration, trouble free operation and a long service life. ?

基础油的质量对液压油的过滤性能、液压系统的平稳运行和液压油的长寿命使用有着重大影响。

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Dry-type transformers require minimum maintenance and provide long years of trouble-free service.

干式变压器的最低要求，并提供免费维修服务多年的麻烦。

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This means that products are expected to always work "out of the box" and to be reliable in general use and to give long, trouble free service.

这意味着产品总是“可拆盒即用”的、具备可靠的使用并可以提供长期、免费的服务。

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