锇：是一种密度大的自然元素——其密度是铅的两倍——这种蓝灰色的金属在需要硬度和稳定性的应用领域大放异彩。
Osmium (Os) : The densest of natural elements-twice as dense as lead-this blue-grey metal finds a home in applications where hardness and durability are essential.
“通过设计掺杂物的性质，形状和密度，你可以获得一些，在整体性质上，在自然界中不同寻常而且难以得到的东西。”Engheta说。
"By designing the properties of the inclusions, as well as their shapes and density, you achieve in the bulk property something that may be unusual and not readily available in nature," Engheta said.
他把低音单元按“口味”放置在鼓皮外低频比较有密度的地方—简单的移动直到你听到最自然的低频为止。
He positions the woofer to taste on the outside head in which the low frequencies are thick - simply move around until you hear the most natural low frequencies.
应用推荐