請教下文中短語be committed to的意思
The properties version of the contradiction--a natural extension of the classes or sets version--raised serious doubts about whether one can be committed to objective existence of a property or universal corresponding to every specifiable condition or predicate.
這是有關(guān)羅素悖論的一段講述，大家不必注重其具體內(nèi)容，能說清楚這里的commit是什么意思即可，
再看以下這句，好象與大家所說的不是很相符：
We need a theory of reference that renders the sentence 'Polar bears are white' meaningful and true and the sentence 'Unicorns are black' meaningful and false,and yet does not commit us to the existence of unicorns.