Self - winding mechanical wristwatches made their appearance during the 1920 s.

到了1920年代,能够自动上发条的机械手表就上市了.

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What kind of watch do you mechanical watches, or quartz watches?

店:您要哪一类手表:机械手表, 还是石英手表?

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Mechanical watches, or quartz watches?

机械手表, 还是石英手表?

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The rule made officially by Swiss says, that first - rate watch error is not beyond 10 seconds.

瑞士官方制定的规则说优等品机械手表每日误差应控制在10秒以内.

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