单词	signum
释义	signum noun sig·​num ˈsignəm plural signa -nə 1 : something that marks or identifies or represents : sign, signature 2 [Medieval Latin, from Late Latin, ringing of a bell, from Latin, sign] : a tower bell large enough to serve as a signal Word History Etymology Latin First Known Use 1643, in the meaning defined at sense 1
随便看	spacefarings spaceflight spaceflights spacelabs spaceless spaceman spacemen spaceport spaceports spacer spacer bar spacers spaces spaces out spaceship spaceships spacest spacesuits spacewalk spacewalked spacewalker spacewalkers spacewalking spacewalks spaceward

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