It relies on a series of cameras and ultra-soundradar sensors that ensure the car stays in lane and is a safe distance from other cars.
依靠一系列的摄像机和超声雷达感应器，汽车能够确保在车道内行驶，并与其他车辆保持安全距离。
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Unlike high altitude aircraft, helicopters aren't so vulnerable to being seen by radar, as they fly low and are often hidden by the terrain. The big issue is the sound.