为了根系机能正常活动，必须有个良好的通气条件。

Roots must have good aeration in order to function properly.

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为了使发电机能正常运转发电，请在使用前详细阅读本说明书。

To run the machine correctly, read this guidance carefully before use.

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尽管水不提供任何能量或热量，身体却需要大量的水以保证机能正常。

Although water does not provide any energy (or calories), the body requires large amounts of it in order to function properly.

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It turns out there's actually no natural function known in the body for lithium.

事实上我们已知的身体机能,在正常情况下根本不需要锂。

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Or more carefully, it's way about talking about certain things the body can do when it's functioning properly, when it's well tuned, as we might put it.

或者更谨慎地说是谈论,身体在机能正常的时候,可以进行的一些活动，我们也可以说在音调调好的时候。

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