What is the definition of Difficulty Blood Cells?

"Difficulty blood cells" is like when you're trying to make a sandwich but keep running out of mayo, but instead, it's the tiny, tiny blood cells. You know those pesky red blood cells that carry your oxygen like a delivery service, but sometimes they're so sluggish, they're like a slow-moving, oxygen-starved, "Ugh, what's wrong with me?" truck.

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Edgy example sentence: "The detective's attempt to solve the mystery was as difficult as finding a needle in a barrel of blood cells that were actively sneaking away in the dark."