Our current CDs and DVDs store data along a narrow spiral track in a thin layer of polycarbonate plastic.

我们现在的CD和DVD沿着一个狭窄的螺旋轨道把数据储存在一个微笑的塑料里。

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The back of the patella is lined with a thin layer of cartilage known articular cartilage. This layer helps the patella track up and down along the front of the femur.

髌骨的背侧有一层薄薄的关节软骨，有助于髌骨沿着股骨前侧进行向上与向下的移动。

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Setting the race on thin water film areas and projecting the track on in interior display of the vehicle, this type of racing's only been seen thus far in science fiction arcades.

设置薄水膜地区的比赛，并预测在车辆内部跟踪显示，这个比赛唯一被视为迄今在科幻商场类型。

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Reilly thinks the ETF is a disaster for the investors picking up the tab because it buys futures in a bid to track a thin underlying market.

FORBES: How To Avoid ETF Pitfalls