一声尖利的吼叫在猎人们身后传来，使它们停止前进。
A sharp bark behind the Hunters made them halt in their tracks.
当物流运输装置在前进时遇到障碍时，则采用图像和光电传感器双重识别，使运输装置自动停止，并发出报警信号。
When the device meet the obstacle while moving forward, it can stop and alarm automatically through the image and optical electrical sensors which perform dual identify.
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