The millimeter-wave machine is grayish-white and is more cylindrical.

而毫米波扫描仪则是灰白色的，有些像圆柱形。

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And wave machine is more and more widely used as an important research tool.

造波机作为一种重要的研究工具，也越来越得到普及应用。

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My surfboard was quickly ripped out from underneath me, its leash yanking me into the wave's violent washing-machine wake.

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Rotenberg said he still has privacy concerns about millimeter wave machines, including what information is captured by the machine -- even if unseen by screeners -- and how long that information is retained.

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