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来源:雅诚德英语网
Half the animals could switch off the current by turning a wheel in their enclosure, while the other half could mot.
一半的动物可以通过在笼子里转动轮子来切断电流,而另一半可以不动。
Half the animals could switch off the current by turning a wheel in their enclosure, while the other half could mot.
一半的动物可以通过在笼子里转动轮子来切断电流,而另一半可以不动。