Methods The color and transparency of different concentration phantoms were observed. Properties including density, acoustic speed and acoustic attenuation of PAA gel phantom were measured.

方法观察模块浓度的不同所致颜色与透明度的变化，并对PAA模块的声学特性包括密度、声速及声衰减进行测量。

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As part of the research, Phantom Works has built a scale model for wind-tunnel testing of the concept "s low-speed flying characteristics."

为配合这项研究，鬼怪工程部建立了一支尺模型风洞测试的概念车的低速飞行的特点。

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Vision Systems just upped the 4k speed barrier by a near order of magnitude with the launch of its Phantom Flex4K cinema camera at NAB.

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