To have a grand beginning but a weak or disappointing conclusion; to start strong but end poorly, failing to sustain initial momentum.
他们这项计划一开始声势浩大，投入了大量资源，但最终却不了了之，真是龙头蛇尾。
Their project started with great fanfare and significant resource investment, but ultimately fizzled out without a clear conclusion, truly exemplifying a grand beginning with a weak end.
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