external phloem造句

"external phloem"是什麽意思   


  1. Internal phloem is mostly primary, and begins differentiation later than the external phloem and protoxylem, though it is not without exceptions.
  2. In some eudicot families ( Apocynaceae, Convolvulaceae, Cucurbitaceae, Solanaceae, Myrtaceae, Asteraceae, Thymelaeaceae ), phloem also develops on the inner side of the vascular cambium; in this case, a distinction between "'external phloem "'and "'internal phloem "'or "'intraxylary phloem "'is made.
  3. It's difficult to find external phloem in a sentence. 用external phloem造句挺難的


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