Fatigue is a common side effect of iron deficiency, which can lead to anemia, or low red blood cell levels. Anemia can also show up as abnormal pallor.
疲劳是一种常见的缺铁表现，缺铁可导致贫血或者说降低血红细胞水平。贫血也可以表现为异常苍白。
So to come, fatigue is the norm, not fatigue is abnormal.
如此想来，疲劳是常态，不疲劳才是反常。
In children, abnormal heart rates may cause fatigue, upset stomach, dizziness and lightheadedness.
对于儿童，心律失常还可能导致疲劳、胃部不适、头晕和头晕等症状。
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