I don't understand what you mean by "connected to 'to be able~'" versus "connected to 'to understand~'". The possible interpretations seem to be: "Learning a new language well enough to be able to understand it when heard, well enough to be able to speak it ... " "Learning a new language well enough to be able to understand it when heard, well enough to speak it ...
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tashiroThank you for the reply. The both sentences have the same meaning?For all practical purposes, yes.