求翻译：继续对系统抽真空，这个过程时间不得少于60分钟，因为水分的流动，蒸发需要一定的时间，抽真空结束时，应先将高低压手动阀关闭，然后关闭真空泵。是什么意思？

Continue to vacuum the system, this process is not less than 60 minutes, because the flow of water, evaporation will take some time, the end of the vacuum should be the first high and low pressure manual valves closed, and then turn off the vacuum pump.

Continue to vacuum system, the process time of not less than 60 minutes, and because the moisture evaporates, the flow needs to be a certain amount of time at the end, vacuum, High pressure should be manual, the valve is closed and then turn off the vacuum pump.

Continues to pull out the vacuum to the system, this process time does not have to be short in 60 minutes, because of the moisture content flowing, the evaporation needs certain time, when pulls out the vacuum conclusion, should the high and low pressure hand operated valve closure, then close first

Continue to vacuum on the system, this process time shall not be less than 60 minutes, because the flow of water evaporation requires a certain amount of time, at the end of vacuum, it should first be high and low pressure manual valve is closed, and then close the vacuum pump.

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