spectra Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++spec·tra /ˈspektrə/ x-refthe plural of spectrum spectrum 的复数形式spec·traChineseSyllable See spectrum for more spectraspec‧tra /ˈspektrə/ the plural of spectrum spec·traBrE /ˈspektrə/ 🔊NAmE /ˈspektrə/ 🔊 plural of spectrum