... sheath cell ==> 鞘细胞 sheath column ==> 鞘柱 Sheath current ==> 外皮电流 ...
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There are 2-3 layers of long-column-shaped palisade tissue under the upper epidermis, and there are a great number of mechanical tissues which made up of vascular bundle sheath .
上表皮下方有2-3层长柱形的栅栏组织，在主脉大侧脉外方具有由大量机械组织组成的束帽或束鞘。
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