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 news comes a day after developers of the new Circuit of Americas track said building had stopped.

这个消息发布于美国大奖赛赛道的建筑商宣布赛道停工一天后。

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Complex sentence: the system shall be able to display the elapsed time for the car to make one circuit around the track within 5 seconds of the lap completion.

复合句：系统应能在车沿跑道绕行一圈后5秒之内显示这一圈花费的时间。

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The figure is a measure of circuit track density and broadly relates to processing power and energy consumption.

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Officials earlier reported that the track circuit had been repaired June 17, five days before the crash.

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The NTSB says it is now reviewing documentation on the performance of the track circuit both before and after the June 17 repair.

CNN: NTSB says train detection system failed in days before D.C. crash