Oftentimes, inventions that seem, in the abstract, to be good ideas may be impossible because something that you have to do to make it actually come into practice is too expensive and so it's not economic to produce the invention.

通常在理论上,创新固然不错,但却很难实现,因为把创意变成现实,花费会相当的昂贵,实现这样的创意非常不合算

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and what is a good practice to do is help develop your ideas of the things - set your intentions,

这个练习会帮助你发展思维——确定你的打算。

英语写作：技巧 - SpeakingMax英语口语达人