In this paper, a fast approach for box dimension estimation based on a dual pyramid data structure is developed.

在实数域分形盒维数计算方法的基础上，提出了双金字塔数据形式的盒维数快速计算方法。

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The woofer is mounted inside a dual-chambered box; the woofer fires from the sealed chamber into the ported chamber, and sound waves emerge from the ported side.

低音扬声器登上在一个双重有房间的箱子里面；低音扬声器火从被密封的分庭入被端起的分庭，和声波从被端起的边涌现。

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These kits consist of a dual ac, GFCI or faceless GFCI enclosed in a single gang box with a metal or plastic cover.

这些套件包括一个双交流漏电开关或一个隐藏的漏电开关，封闭在一个带有金属或塑料盖子的单工盒内。

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