每个小时换一次。
如果资金不成问题，买一双而且每几个小时就换一次。
If funds aren't an issue, get both and switch it up every few hours.
在阿尔法哨所有30—50名美军人员，他们24小时执勤，每六周轮换一次，在此期间基本不允许离开基地。
The 30 to 50 American troops stationed at Point Alpha were on call 24 hours a day for six weeks at a time and were rarely permitted to leave their base during that period.
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