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1. Oxford American Dictionary

   opportunistic

   • IPA[ˌäpərto͞oˈnistik]

   美式

   • adj.
     exploiting chances offered by immediate circumstances without reference to a general plan or moral principle；(of a plant or animal) able to spread quickly in a previously unexploited habitat
2. • 釋義

   adj.

   形容詞

   • 1. exploiting chances offered by immediate circumstances without reference to a general plan or moral principle the change was cynical and opportunistic
   • ▪ (of a plant or animal) able to spread quickly in a previously unexploited habitat opportunistic populations colonizing new substrates
   • ▪ (of a microorganism or an infection caused by it) rarely affecting patients except in unusual circumstances, typically when the immune system is depressed.