Both bus tours forbade the use of cell phones but one tour provided digital cameras and encouraged people to take photos.
两辆观光巴士都禁止使用手机，但其中一辆观光巴士提供数码相机并且鼓励大家拍照。
They can also use cameras and send photos back to Earth.
它们还可以使用相机将照片传回地球。
He then asked them to rate the image for attractiveness and while they studied the photos used infra-red cameras to track their eyes.
在志愿者观察照片时，他用红外线摄像头跟踪他们的眼球，然后要求志愿者对照片的吸引力评分。
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