the critical period hypothesis
【正确答案】：The critical period hypothesis refers to a period in one’s life extending from about age two to puberty ,during which the human brain is most ready to acquire a particular language and language learning can proceed easily, swiftly ,and without explicit instruction.
【题目解析】：临界期假设是指人一生中从大约2岁到青春期的一段时间，在这段时间内，人类大脑最容易获得特定的语言和语言学习。可以轻松、快速地进行，无需明确指示。
