Brown's Theory of grain crisis is not devoid of merit. It sounds the alarm to those who are unrealistically optimistic in a way.

布朗的“粮食危机论”决非一无是处，至少对盲目乐观派敲响了警钟。

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Problems arise when the optimistic proponents are unrealistically optimistic about how the new technology will perform.

FORBES: Curb Their Enthusiasm: CEO Optimism Can Be A Security Risk

Doctors, it turns out, are prey to all kinds of unrealistically optimistic impulses.

FORBES: Do Oncologists Lie to Their Patients About Their Prognoses?