周皮木质根或干的外层组织，包括软木形成层和形成层的产物，如软木。
The outer layers of tissue of woody roots and stems, consisting of the cork cambium and the tissues produced by it, such as cork.
至今，公司已连续推出包括皮纹系列，米洞石系列，牛皮纸系列，软木系列在内的二十几个硅藻泥原创系列。
So far, the company has been introduced including dermatoglyph series, rice hole stone series, kraft paper series, cork series, more than 20 diatom mud original series.
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