Something is extremely easy to do; a piece of cake; effortless.
对于经验丰富的他来说，完成这个简单的任务简直是灶上扫除，不费吹灰之力。
For him, with his rich experience, completing this simple task was as easy as sweeping the stove, requiring no effort at all.
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Something is extremely easy to do; a piece of cake; effortless.