I don't need it. In fact, listening to cows is not so much a smoke machine as buying a powerful listening cow resource and giving it a stereo ~ ~ ~ Both language learning and ancient poetry learning follow the order of listening, speaking, reading and writing. Because these early education machines have relatively few resources, the quality of their own resources is not high, and the cost performance is relatively low. At the same time, the cow listened to the fire, and all major maternal and child marketing numbers began to buy, but for the portable version, the price was close to 600 yuan.