The track light portfolio includes one and two-circuit track heads with dimming capability and is backwards compatible with other track systems.

轨道灯系列产品包括调光功能之一，双回路轨道灯，并与其它轨道系统向后兼容。

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The light it gives off can then be used to track the protein in living cells.

它发出来的光可以用来跟踪生物细胞中的这种蛋白质。

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That has probably happened already, though the light symptoms shown by most patients make cases hard to track, he said.

这个或许已经发生，可是大多数病人轻微的症状让这些病例很难去追踪，他说。

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Also included is the title track from Queen Latifah's album of jazz standards "Travelin' Light."

VOA: standard.2010.04.12

"For athletics,track and field and for swimming, there's kind of like a traffic light.

VOA: standard.2009.09.10

Armed with their iPhones, they were able to use the GPS and mapping features to get to the exact positions they needed to track the light.

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The trail begins with two hours of a light track until you reach the Carrasqueira, a steep wall of stone crossed with the use of ropes and helmets.

BBC: Trekking in Rio de Janeiro

Sunday's race will be the first time an F1 race has started in daylight and ended under floodlights and the drivers were quick to get out onto the track to assess the impact of the changing light conditions and the cooler track temperatures.

BBC: Kovalainen top as McLaren shine