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1·During sleep, the researchers found, alpha waves are still present—they're just drowned out by the theta and delta waves, like the din of a noisy restaurant drowns out individual conversations.

研究人员发现，α波在睡眠期间仍然存在——它们只是被θ波和δ波所掩盖了，就如同餐厅中个别的谈话被喧嚣嘈杂的声音淹没一样。