The new lens, which is thinner at the bottom than at the top, steers light to a viewer's eyes by switching light-emitting diodes along its bottom edge on and off.

这个新镜头，底部比顶部更薄，通过切换镜头底部边缘的发光二极管的开和关，控制进入到观众的眼睛的光线。

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The Heligendamm discussions on the issue involve not only the G8 but leaders from other top CO2-emitting countries, such as China and India.

海利根达姆会议对这个问题的讨论不仅涉及八国集团，而且还涉及其它CO 2排放大国，如中国和印度。

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Five of those are in Texas, four of which are owned by Luminant Generation that also owns the top-ranked mercury-emitting plant.

FORBES: Coal Plants Belching Out Less Mercury

OLETs rely on three layers of material, with the bottom layers carrying a charge, the middle layer (the meat in this high-tech sandwich) emitting photons when excited by the bottom, and the top layer selectively letting those photos through.

ENGADGET: Organic Light Emitting Transistors might make us forget all about OLED