短语词组短语buried d channel fet 埋沟场应晶体管buried d channel transistor 埋沟晶体管buried -channel 埋沟buried ancient channel 埋藏古河道buried paleoriver channel 埋藏古河道buried d channel ccd 埋沟电荷耦合掐buried river channel 埋藏河槽 返回 buried channel