顾名思义，MailBox从本质上说就是Drop，用于在检测之前保存数据块的单槽缓冲区。

As its name implies, MailBox is essentially the Drop by itself, a single-slot buffer that holds a piece of data until it has been retrieved.

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此外，蜗杆的蜗杆槽深度随压力的增高而减少，在排气结束，星轮齿脱离单槽时，深度为零，故不存在余隙容积。

In addition, the worm and worm groove depth of the pressure increased, in the end, reduce exhaust gate-rotor from the single slot, depth is zero, it does not exist.

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因此对于铝电解出铝操作而言有两个问题亟待解决，单槽出铝量的准确计量和单槽出铝精度的自动控制。

So two main problems was taken out in the process of production, which are measuring the mass of aluminum in one bath accurately and controlling the precision exactly.

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