reinforcement and gradualness of development
Teachers Presentation and Students Practice(讲解与练习) Reinforcement and Gradualness of Development(强化与循序渐进) Spoken Language and Standard Varieties(口语与标准语) ..
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reinforcement and gradualness of development
发展的加强性和渐进性
以上为机器翻译结果，长、整句建议使用 人工翻译 。