免疫力强弱怎么看？这4个信号告诉你
正常情况下，一个成年人一年感冒2~3次属于正常范围。但如果频率明显增多，说明身体的免疫防线已经变得薄弱，无法有效抵御外界病原体的侵袭。
二、精神不振、总感觉疲惫无力
免疫力强的人通常精力充沛、思维清晰，做起事来干劲十足；而免疫力低下的人则常常感到疲倦乏力，即使休息充足也难以缓解。
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