The small wheels hidden underneath thevehicle’s aerodynamic shape are able to rotate 180 degrees.

Citizen Tarelkin车轮小巧，隐藏在符合空气动力学原理的车身下方，可以180度旋转。

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On the surface the application looks to be of high quality and in good condition, but these problems are hidden underneath.

表面上，应用程序看起来质量很高且状况良好，但是这些问题却隐藏在下面。

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The effects of foliage on electromagnetic wave propagation are important in the detection of targets hidden underneath foliage.

研究叶簇对电磁波传播的影响对于雷达穿透叶簇探测隐蔽目标具有重要意义。

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It is having to cut its prices on some land, to win over buyers afraid of what may lie hidden underneath.

ECONOMIST: Panama

The Rapiscan machines will be replaced by scanners made by L-3 Communications Holdings that use radio waves to detect suspicious objects hidden underneath clothes.

BBC: TSA to phase out Rapiscan 'naked scanners'

Though the kids sit in the driver's seat and even steer the car sideways, a hidden rail underneath always guides them back to the middle.

WSJ: Are Smart Gadgets Making Us Dumb?