circumoral pallor

例句：

1. 1. The circumoral pallor is caused by the lack of oxygen in the blood.
   环形苍白是由于血液中缺乏氧气造成的。
2. 2. The circumoral pallor was a result of the patient's severe illness.
   环形苍白是患者严重疾病的结果。
3. 3. The circumoral pallor was due to the fact that the patient had been under heavy medication for several days.
   环形苍白是因为病人在几天内服用了大量药物。