外生的

The two major groups of mycorrhizal fungi are the ectotrophic and endotrophic types.

主要的菌根真菌有两种：内和外。

Single cancellous osteomas, unlike exostosis, are a relatively rare lesion in the external auditory canal.

疏松骨瘤，不像外骨疣，是个外耳道较少见的病灶。

There are three microscopic organizational modes of cyclic economy in the perspective of supply chain, i.e., green supply chain, endo-symbiosis supply chain and exogen-symbiosis supply chain.

摘要基于供链角度提炼了循环经济的三种微观组织模式：绿色供链、外共供链和内共供链。