The reason millions are learning it is simple: it is the language of international business and therefore the key to prosperity.

数百万人学习英语的原因非常简单：英语是国际商业语言，因此也是走向繁荣的关键。

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They reappraised the key role of the teacher in the learning process.

他们对教师在教学中的关键作用重新进行了评价。

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One of the key motivators for learning tends to be "success" in one form or another and consciously or not, success is usually perceived as a step towards happiness.

学习的重要原动力之一往往就是某种形式有意无意的“成功”，通常被视为通往幸福的必经之路。

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The International Seminar on "the Implementation of National Qualifications Frameworks (NQF): Policies and Strategies" will serve as a platform for the government of Thailand to draw key learning points from the experiences of various countries to help them design specific policies for the future implementation of a Thai NQF.

UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization

We know that the HR services, in particular learning and talent development strategies play a key role in the success of businesses.

FORBES: The Rising Challenge Of Social Business To HR Departments

Bear's subsequent experiments with mice with fragile X indicate that the brain makes too much of key proteins that prevent proper learning from occurring.

FORBES: Magazine Article