Turn left at the second light and then go straight for two blocks.
在第二个路灯处往左拐，然后直走过两个街区。
Optical module includes first light pipe, second light pipe, and third light pipe.
光学组件包括第一光管、第二光管及第三光管。
The system comprises a first light source, a second light source and a photodetector.
所述系统包括第一光源、第二光源和光电检测器。
The system comprises a first light source, a second light source and a photodetector.
所述系统包括第一光源、第二光源和光电检测器。
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