ad li·bi·tum /(ˌ)ædˈlɪbətəm/
  (ad.)隨意
  ad li·bi·tum /(ˈ)ædˈlɪbətəm/ 副詞
  隨意地,無限制地,隨意,任意
  Ad lib·i·tum At one's pleasure; as one wishes.
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  ad libitum
       adv : without advance preparation; "he spoke ad lib" [syn: ad lib,
              spontaneously, impromptu]