Is the transparent cover on the watch, we see the dial, read the time, there is a table can prevent dust, water vapor and other damage caused by the watch.

就是手表上那个透明盖子，通过它我们看到表盘，读取时间，还有表蒙可以防止灰尘、水气等对手表内部造成损害。

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At the same time, do not open the back cover, so as to avoid dust, fiber, water vapor and other invasive table machine, affecting the normal travel time.

同时，不要随便打开手表后盖，以免灰尘、纤维、水汽等侵入表机，影响手表的正常走时。

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All the calculation values fall under the allowance range of the international water vapor skeleton table published in 1985.

计算值全部落在1985年公布的国际水蒸气骨架表的允差范围以内。

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