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An unhappy mixture of ideology and practicality .

这是思想意识与实用性的不快乐结合。

A similar combination of vision and practicality is needed now in response to a very different challenge the risk of a fundamental change in the earth 's climate caused by emissions of carbon .

如今，我们需要一次类似的远见与实际的结合，以应对另一项截然不同的挑战碳排放导致地球气候发生根本变化的风险。

Practicality also played a part .

实用性也发挥了作用。

But practicality is hardly a defining characteristic .

不过实用性却几乎不是一个可以定义的特征。

Without him , the following invention would have had considerably less practicality .

没有他，之后的发明就不会有多少实用性。