译：二极管是一种只允许电流以一个方向流过的元件。
Diodes are components that allow current to in only one direction.
并指出了SHS陶瓷内衬复合管的研究方向。
The research direction of the compound pipe prepared by SHS was also pointed.
目的：根管消毒剂是根管治疗术的三大研究方向之一。
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。
Objective: root canal disinfectant is one of the three research directions of root canal therapy.
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