The traditional date-based migration looks at the date objects, comparing to system date before a migration will take place.

传统的基于数据的移植关注日期对象，在移植发生前与系统日期相比较。

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Some of the objects in the exhibition date from the 1930s.

展览中的一些物品是20世纪30年代的。

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Most of the invisibility cloaks that have been demonstrated to date conceal objects at frequencies that are not detectable by the human eye.

大部分隐身斗篷都是在非可见光波段隐藏物体。

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Fragments of ski-like objects, discovered by 1960s archaeologist Grigoriy Burov, date back to 6000 BC in northern Russia.

BBC: Where did skiing come from?