是由根的内部组织形成的，故称为内起源。也叫侧根，是主根生长达到一定长度，在一定部位上侧向地从内部生出许多分支。
分支根 branched root
支柱根 [植] prop root ; [植] brace root ; stilt-root ; holdfast root
支票存根 checkbook stub ; check stub ; counterfoil ; cheque stub
支持根 prop root ; brace root
侧支根管 Lateral canals
侧向支根 lateral branch root
支票簿存根 cheque book stub ; [金融] check book stubs ; cheque-book stubs
三根支柱 three pillars
支票存根. cheque stub
目的评价根管超声冲洗对根管预备术后反应及根充后侧支根管充填率的影响。
Ultrasonic irrigation and syringe irrigation were applied respectively in each group during the root canal preparation.
普罗米修斯从战车上点燃一支火把，把火放在一根空心的茎里，藏在他的斗篷里。
Prometheus lit a torch from the chariot and put the fire in a hollow stalk that he concealed under his cloak.
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