单词	heptavalent
释义	heptavalent /ˌhɛptəˈveɪl(ə)nt / adjective Chemistry Having a valency of seven.There is no evidence before me of the solubility either of divalent or of heptavalent manganese.... Administration of trivalent licensed antitoxin or heptavalent botulinum may prevent or decrease a patient's progression to respiratory failure and hasten recovery. The new heptavalent conjugated pneumococcal vaccine should be given from two months of age.
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