A key part of learning by doing concerns learning from your mistakes. From the day we’re born, we learn by discovering how not to do things, and then trying over and over until we get it right.
单词
concern 英 [kən'sɜːn] 美 [kən'sɝn] vt. 涉及,关系到;使担心 n. 关系;关心;关心的事;忧虑