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.
學者總是被要求證明其研究的「影響」。（是像被一輛不規矩的自行車撞了一下？還是更像一臺打樁機、甚至是一次小行星撞擊？）儘管詢問某項學術研究是否有用並非不合情理，但要回答這一問題，難度非常大。
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