Since information and knowledge in every field is doubling every 2-3 years, this means that your knowledge has to double every 2-3 years as well.
出自：国家开放大学-人文英语3
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Since information and knowledge in every field is doubling every 2-3 years, this means that your knowledge has to double every 2-3 years as well.
出自：国家开放大学-人文英语3