percurrent

常見例句

• Secondary veins are semicraspedodromous and form marginal loops, tertiary veins are percurrent, quaternary veins form orthogonal or polygonal areoles filled up by branched and freely ended veinlets.
  二級脈在葉緣內(nèi)分支，相互連接形成脈環(huán)，三級脈及頂型，脈間區(qū)內(nèi)充滿分支的自由結(jié)束的小細脈。
• major veins impressed, rarely flat adaxially, lateral veins 7-10 pairs, tertiary venation weakly percurrent.
  主脈凹陷，正面很少平，側(cè)脈7-10對，支脈弱頂。
• percurrent proliferation
  及頂增殖
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