critical period的用法和樣例：
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，兒童在屬於早期臨界期的嬰幼兒階段被剝奪正常視覺刺激，就會患上弱視，導致永久性的視力缺損。 - Childhood is a key period for children to form their adult psychology and human features.
摘要兒童時期是形成成人心理及人格特徵的關鍵期。
