单词	tetrode
释义	tetrode noun tet·​rode ˈte-ˌtrōd  : a vacuum tube with a cathode, an anode, a control grid, and an additional grid or other electrode Word History First Known Use 1886, in the meaning defined above
随便看	hard-heartedness hard-hit hard-hitting hard-knock hard-laid hard-line hard-liner hard-luck hard-nosed hard-on hard-ons hard-paste porcelain hard-pressed hard-set hard-shell Hard-Shell Baptist hard-shell clam hard-shell crab hard-shelled hard-sized hard-stemmed bulrush hard-surface hard-times token hard-wearing hard-won

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