词汇	negative classroom
释义	negative classroom 隐性课堂
随便看	isotope peak isotope peak displacement method isotope placentography isotope placentograpy isotope poison isotope poisot isotope pool isotope powered device isotope power generator isotope prodruction reactor isotope-producing isotope production isotope production calculator isotope production reactor isotope production reactor of general atomic isotope production tunnel isotope production unit isotope,radioactive isotope ratio isotope ratio mass spectrometer isotope-ratio mass spectrometer isotope ratio mass spectrometre isotope ratio mass spectrometry isotope ratio measurement isotope ration mass spectrometer