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。
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。
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。
Linear-dendritic hybrid copolymers are a special type of copolymers composed of both dendritic (d) and linear polymer blocks (l) which are linked together by covalent bonds.
线形-树状体杂化嵌段共聚物是由树枝状高分子嵌段(d)与线形高分子链(L)通过化学键连接而成的一类特殊拓扑结构的共聚物。
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。
The Simpson (D) index of the residence community with more green space functional blocks is higher , and that of residence community built earlier.
通过管理成本、观赏价值、生态效益的对比，在城市住宅区绿化中，林木的优点远远超过铺种草坪。
The Simpson (D) index of the residence community with more green space functional blocks is higher , and that of residence community built earlier.
通过管理成本、观赏价值、生态效益的对比，在城市住宅区绿化中，林木的优点远远超过铺种草坪。
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