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insoluble

adjective
🔊/ɪnˈsɒljəbl/
🔊/ɪnˈsɑːljəbl/
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  1. (of a problem, mystery, etc.问题、谜团等) that cannot be solved or explained无法解决的；不能解释的
    • The problem seemed insoluble.问题似乎难以解决。
    Oxford Collocations Dictionaryverbs
    • be
    • seem
    • remain
    • …
    adverb
    • almost
    • apparently
    • seemingly
    • …
    See full entry
  2. insoluble (in something) (of a substance物质) that does not dissolve in a liquid不能溶解的；不溶的
    • These chemicals are practically insoluble in water.这些化学物质几乎不溶于水。
    Topics Physics and chemistryc2
    Oxford Collocations Dictionaryverbs
    • be
    adverb
    • highly
    • relatively
    • almost
    • …
    preposition
    • in
    See full entry
    3. opposite soluble
    Word Originlate Middle English: from Old French, or from Latin insolubilis, from in- ‘not’ + solubilis, from solvere ‘loosen, unfasten’.