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。
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.
你呆在一间漆黑的屋子里，屋里有一支蜡烛、一个柴炉和一盏煤气灯。如果你手里只有一根火柴，你会先点亮什么？
If you are in a dark room with a candle, a wood stove and a gas lamp. You only have one match, so what do you light first?
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