But in many cases, these systems have been maintained for many years — i.e., these are "legacy systems" that are important for the enterprise, but they are often difficult to understand and maintain.

但在很多情况下，这些系统维持了许多年——也就是，这些是对企业很重要的“遗留系统”，但它们经常是很难被理解和维护的。

youdao

Chile, one of the most successful economies in Latin America, maintained controls on capital inflows for many years but has now suspended them.

智利是拉美最成功的经济体之一，多年来一直对资本流入实行管控，但目前已中止了这一做法。

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However, for years after that even many devoted Blackberry handset users maintained a separate cell phone for voice.

尽管如此，多年后仍有相当多的忠实用户在使用没有语音通话功能的黑莓手机。

youdao

The chemicals industry has historically operated under high levels of market competition and regulatory scrutiny with the result that chemicals companies typically have for many years maintained a sharp focus on operational risk.

FORBES: Risk Analytics: Insights for Chemicals Companies

While many questions remain about how Castro maintained such tight control over the women for so many years before one of them made a daring escape Monday, the horrors they suffered are beginning to come to light.

NPR: Cleveland Man Arraigned On Rape, Kidnap Charges

However, for years after that even many devoted Blackberry handset users maintained a separate cell phone for voice.

ENGADGET: Switched On: The Peek of popularity