Describes a task that is extremely easy to accomplish, requiring minimal or no effort, often implying an overwhelming advantage, like using a mountain to crush an egg.
对于经验丰富的他来说，完成这种基础性的项目简直是排山压卵，不费吹灰之力。
For someone with extensive experience, completing this basic project is like pushing mountains to crush an egg, requiring no effort at all.
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