若没电了，就用手动方式操作。
可以在缸体上方安装手轮和齿轮箱，以便在没有缸体动力源时，紧急采用手动方式操作。
Handwheels and gear boxes can be mounted on top of the cylinders for emergency operation due to loss of operating medium in the cylinder.
因为这种操作是手动的，所以仅一小部分行李可以通过这种方式检测。
Because this is a manual operation, only a small share of bags are examined this way.
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