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师：高粱的根裸露在地面的部分叫什么？生：气根。师：作者用手摸，发现了高粱的根有什么特点？生：坚韧、有力。
Teacher: What is the part of the root of sorghum exposed on the ground? Health: gas root. Teacher: The author touched by hand, found the root of sorghum have what characteristics? Health: tough, powerful.