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Objective: root canal disinfectant is one of the three research directions of root canal therapy.
目的：根管消毒剂是根管治疗术的三大研究方向之一。
youdao
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There is a canal between the three cities.
这三个城市之间有条运河。
youdao
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There is a canal between the three cities.
这三个城市之间有条运河。
youdao