Many stumbling blocks remain, however, including the added costs of filming and broadcasting 3-d images.

当然还有很多障碍，包括增加电影和播出三维影象的预算。

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Jizhong area, the main oil producing area of North China Field, has been in high degree of exploration at present. 3-d seismic prospecting blocks have been connected.

作为华北油田主要产油区的冀中地区，三维地震已经基本连片，勘探程度相当高。

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The accompanying set of 52 CARDS shows how the blocks can be used to create 2-d or 3-d patterns (children look at a card and try to recreate the pattern).

伴随的52张演示了块可用于创建二维或三维模式(孩子们看一张卡片，试图重现模式)。

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