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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As a result dimensioning to the Max. Load in the fully extended position gives reasonable guide dimensions and trouble-free service.

因此，在全伸长下最大载荷的所给定的尺寸是合理的导向件尺寸并可保证免于维护。

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Beijing, for instance, found itself in great traffic trouble when the city announced to provide free metro service for its citizens during the Asian Games in 1990.

比如，1990年北京亚运会期间，当该城市宣布为市民提供免费地铁服务后，就遇到了巨大的交通麻烦。

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Though Hulu has had little trouble serving up broadcast programming from 30 Rock to Desperate Housewives, securing cable series on the free (advertiser-supported) service has proved trickier.

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