If the same cow returned, the sensor recognized the unique signal of the tag and prevented the cow from getting a second helping until after enough time had passed for her to digest the first.
当这头奶牛再次过来觅食时，传感器能够识别触这头牛耳朵上的装置，不再给它喂食，直到足够它消化完前一次食物的时间过去。
If the same cow returned, the sensor recognized the unique signal of the tag and prevented the cow from getting a second helping until after enough time had passed for her to digest the first.
当这头奶牛再次过来觅食时，传感器能够识别触这头牛耳朵上的装置，不再给它喂食，直到足够它消化完前一次食物的时间过去。
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