在20世纪40年代，空中交通管制中心能够而且确实利用了第二次世界大战中新研制的雷达和改进的无线电通讯，但是这个系统还处于初级阶段。

In the 1940s, ATC centres could and did take advantage of the newly developed radar and improved radio communication brought about by the Second World War, but the system remained rudimentary.

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从20世纪初，尤其是第二次世界大战以来，在世界范围内出现了一种支持国际商事仲裁的政策。

Form early 20th century, especially after the Second world War, the policy of favoring international commercial arbitration come into being around the world.

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新史学是19世纪末20世纪初出现的、在第二次世界大战后兴起的对传统史学进行改良的新的史学运动。

The new-historiography is a new reform movement to traditional historiography, which appeared between the late 19th century and the early 20th century, and rose after World War Two.

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