The slide rule function is used primarily in aviator watches.
2
第二次世界大战劳力士等品牌的威望得到英国皇家空军飞行员，他们买劣质手表取代这是发给他们。
By World War II, the Rolex brand had gained such prestige that British Royal Air Force pilots bought them to replace the inferior watches that were issued to them.
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