求翻译：　　Why did Irene spend so much time getting a parrot to talk? Scientists like Irene are interested in discovering how intelligent(聪明) animals are and how their brains work. But studying animal intelligence has been difficult, partly because animals haven't been able to communicate(交流) clearly with humans. Teaching Alex to speak words that he understands has let Irene talk to him directly. She can ask him questions, and he can answer them in English. In this way, Irene is finding out what kinds of things Alex's brain can do. She has found that parrots are much smarter than scientists used to think.是什么意思？

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