It is efficient when used properly.

正确使用时，它才有效。

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The SPT is a tremendous utility and when used properly, should be a critical part of any System p architect's repertoire.

SPT 是一个非常强大的实用程序，如果运用得当，它将是所有 System p 架构师的必备工具。

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But lately, many designers have found that, when used properly, the handwritten style conveys a sense of craft and planning.

不过最近，许多设计师都发现，如果使用得当，手写风格可以传达手工艺和策划的意识。

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What is sad is that these centers are needed for troubled youth, when used properly.

FORBES: Even Judges Commit Crimes, Bad Ones

Even opponents agree that, when used properly, eminent domain can be an effective tool.

WSJ: Battle of the Beach

When used properly, the method completely eliminates the need for manual software testing.

FORBES: Researcher Develops Automatic Software Testing