方钢管桁架是一种将成熟的桁架制造技术和新型的钢管材料有机结合的结构体系。
Square steel-pipe truss is a structure which effectively unions the mature truss manufacturing technology and the new steel-pipe material.
一种新型高效的蓝色有机电致发光二极管材料已经被日本的研究人员研制出来，它完全不含任何金属。
A new, highly efficient fluorescent material for blue organic LEDs that is completely free of metals has been developed by researchers in Japan.
一种新型高效的蓝色有机电致发光二极管材料已经被日本的研究人员研制出来，它完全不含任何金属。
A new, highly efficient fluorescent material for blue organic LEDs that is completely free of metals has been developed by researchers in Japan.
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