这种增长背后的关键因素是农业生产率的提高和贸易的扩大。
Among the key factors behind this growth were increased agricultural productivity and an expansion of trade.
此外，适当的方法是提高效率和产出正向学习成果的一个辅助因素。
In addition, proper methods are a contributing factor in increased efficiency and positive learning outcomes.
这提高了尚未测量的心理因素需要考虑的可能性。
This raises the possibility that, as yet, unmeasured psychological factors need to be considered.
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