Next February 2nd has been dubbed "D-Day" by many computer scientists, with the world expected to run out of IP address blocks at that time.

明年2月2日被许多计算机科学家称为“D日”，预计那时世界上所有IP地址将用完。

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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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People with dark skin produce less vitamin D because the skin pigment blocks ultraviolet light from the sun.

深色肤色的人因色素阻止紫外线的吸收而产生的维生素D较少。

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And the first rumblings of a rights-management system for controlling the sharing of physical things are appearing: The IP-hoarding firm Intellectual Ventures received a patent in October for a 3-D printer feature that blocks the creation of verboten objects.

FORBES: Inside Thingiverse, The Radically Open Website Powering The 3D Printing Movement