单词：critical period
critical period的用法和样例：
例句
- For example, children depried of normal isual stimulation during an early critical period of the first few years of life suffer the permanent isual impairment of amblyopia.例如，儿童在属于早期临界期的婴幼儿阶段被剥夺正常视觉刺激，就会患上弱视，导致永久性的视力缺损。
- Childhood is a key period for children to form their adult psychology and human features.摘要儿童时期是形成成人心理及人格特徵的关键期。
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