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。
The thresholds inside the AGC blocks can be digitally controlled by means of on-chip 4-bit D/A converters.
大厦内的自动增益控制的阈值可数码网，以合片上4位D /A转换器控制的。
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。
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)。
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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