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单词	permatron
释义	permatron noun per·​ma·​tron ˈpərmə‧ˌträn plural -s : a vacuum tube in which the electron flow is controlled by a magnetic field Word History Etymology permanent + -tron
随便看	trying for trying on trying one's hand trying one's hand (at) trying one's hand at trying out tryinglier tryingliest tryingly tryings tryma trymata tryna tryonychoidean tryout tryouts tryp trypa trypaflavine trypan- trypaneid Trypaneidae trypano- trypanocides Trypanorhyncha

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