To overestimate one's own strength and attempt the impossible; to engage in a futile endeavor, like a dragonfly trying to shake a stone pillar.
他想凭一己之力改变公司的旧规，无异于蜻蜓撼石柱，最终徒劳无功。
His attempt to change the company's old rules single-handedly was like a dragonfly trying to shake a stone pillar, ultimately in vain.
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