备份是一项关键的更改控制功能。

Backup is a critical change control function.

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贷款额度是策略的一项关键条件。

The loan amount is a key criterion in the policy.

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使测试成为新架构的过程中的一项关键职能。

Make testing a critical function within your new architecture's procedures.

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But the point is, the main point is, it's not zero.

但关键是，这一项不等于零。

麻省理工公开课 - 热力学与动力学课程节选