单词	Swan spectrum
释义	Swan spectrum noun -nz¦p-, -n¦sp- : the spectrum of the blue cone in a Bunsen burner when operating strongly caused by the excitation of carbon compounds also : a similar spectrum observed in some vacuum-tube discharges Word History Etymology after William Swan †1894 English physicist
随便看	fulbrights fulchronograph fulciment fulcra fulcral fulcrate fulcrum fulcrumed fulcruming fulcrums Fulda fule fulfil fulfill fulfill one's promise fulfilled fulfiller fulfillers fulfilling fulfillings fulfillment fulfillments fulfills fulfilment fulfilments

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