beharmful后面什么介词

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Though drones can be harmful, they can be very helpful.

尽管无人机可能有害，但它们也可能非常有用。

But when stress is encountered continually, the body's reactions are more likely to be harmful than helpful to us.

但当压力不断出现时，身体的反应更有可能是对我们有害而不是有益的。

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The results of a growing number of studies suggest that even a modest vitamin shortfall can be harmful to your health.

越来越多的研究结果表明，即使是轻微的维生素缺乏也会对健康有害。