Academics are always being asked to demonstrate the “impact” of their research. (Is it like being hit by a rogue cyclist? Or is it more like a pile-driver, or even an asteroid strike?) But while it is not unreasonable to ask whether a particular piece of academic research is useful, the difficulties in answering the question are extraordinary.
学者总是被要求证明其研究的“影响”。（是像被一辆不规矩的自行车撞了一下？还是更像一台打桩机、甚至是一次小行星撞击？）尽管询问某项学术研究是否有用并非不合情理，但要回答这一问题，难度非常大。
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