但他们最初提出的是“最佳年龄”(The Optimum Age)的概念，指出:语言习得的最佳年龄是在10岁以内，在此期间大脑保持了可塑性，但随着青春期的到来，可塑性开始消失，这是大脑左半球...
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The optimum age of cuttings ranged 1-2 year.
插穗年龄以1～2年生扦插成活率为高；
In addition to this, there exists a lack of clarity regarding the optimum age for screening and frequency at which to carry out screening.
除此之外，尚不清楚合适筛检的年龄与进行筛检的次数。
The disability caused by a vision deficit has not been quantified and the optimum age and number of occasions for screening have not been established.
因为视力缺损造成的失能尚未被量化，且合适筛检的年龄与筛检次数也不确定。
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