无限维管束（open bundle）：双子叶植物的维管束在初生木质部和初生韧皮部间存在形成层，可产生新的木质部和韧皮部，继续发育而成
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裸子植物和双子叶植物--有形成层，可不断增粗生长，称无限维管束或开放性维管束 (open bundle)。
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open vascular bundle 开放式微管束 ; [植] 开放维管束
·2,447,543篇论文数据，部分数据来源于NoteExpress
By delivering the most robust bundle offering of any video provider, we open up more opportunities for further growth in these largely unserved areas.
ENGADGET: DirecTV, ViaSat launch Exede satellite broadband and TV bundles
Myers' daughter, seeing that the driver left the car door open, went over and peered inside to see personal items that included what looked like a bundle of cash in reality, a dollar bill wrapped around pieces of newspaper.
WSJ: Take the bait? NYPD anti-theft tactics criticized
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