Of all the blue holes in the world, Sansha Yongle Blue Hole in the South China Sea is now the deepest.

目前在世界上所有的蓝洞中，中国南海的三沙永乐蓝洞是最深的。

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The murals in the Yongle Palace total 873 square meters.

永乐宫内璧画的总体面积达873平方米。

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By finite element analysis of circular conical shell, the natural frequencies and vibrational modes of Yongle Bell have been calculated.

本文通过旋转壳体的有限元方法，计算了永乐大钟的主要固有频率和振型。

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It was initially built under the auspices of Emperor Yongle between 1406 and 1420.

BBC: Beijing's once Forbidden City

Originally laid out by Emperor Yongle between 1406 and 1420 with the help of a mere million labourers, the complex is so vast - 800 buildings with 9, 000 rooms spread out over 720, 000 sq metres - that a full-time restoration squad is continuously repainting and repairing.

BBC: Beijing's once Forbidden City