Helen had to learn how to use her hands and fingers to speak for her.

VOA: special.2009.11.08

And they themselves never learn to speak.

他们也不曾学会说话

耶鲁公开课 - 心理学导论课程节选

University of California- San Francisco psychiatrist and neuroscientist Allison Doupe got interested in finches because they provide a model for understanding how people learn to speak.

VOA: standard.2010.04.05