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。
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.
图示红细胞（RBC）与正常相比，体积变小且中心苍白区增加。
The RBC's here are smaller than normal and have an increased zone of central pallor.
红细胞数目过少称为“贫血”。表现为面色苍白，疲劳和呼吸急促。
Having too few red cells is called "anemia". It can make a person look pale and feel tired and short of breath.
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