The vital capacity is a breath biggest ventilation quantity, in a sense may reflect the breath function potential power.

肺活量是一次呼吸的最大通气量，在一定意义上可反映呼吸机能的潜在能力。

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As the mechanical switch has no function of automatic locking and returning to zero in power failure, there exists some potential danger when used in places where safety is called for.

机械式电源开关不具备停电自锁和断电回零等功能，在一些特殊的安全要求较高的场所，使用这种开关也存在着一定的安全隐患。

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