预防性给予氨苯丙胺或沙利霉素也可以保护实验感染的绵羊。

Prophylactic administration of amprolium or salinomycin also protected experimentally infected sheep.

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预防性使用能及时保护发动机，这是由于磨损降低和润滑性改善，以减少机械损伤。

Precautious use can protect the engine in time from mechanical damage due to reduction of wear and tear and improvement in lubrication.

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机构所面临的一个复杂的问题是怎样在他们的潜在的机会成本对保护其IT基本设施(预防性的保护措施)费用的平衡。

A complicated problem faced by organizations is how to balance their potential opportunity costs against the expense of securing their it infrastructure (preventative defensive measures).

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