de-, 不，非，使相反。-fic, 做，词源同defect, efficient. 即没做好，缺陷。

1. Symptoms of anaemia include weakness, fatigue and iron deficiency.

贫血的症状包括虚弱、疲劳和缺铁。

2. They did blood tests on him for signs of vitamin deficiency.

他们给他验了血，以检查是否有维生素缺乏的迹象。

3. AIDS stands for Acquired Immune Deficiency Syndrome.

AIDS是获得性免疫缺损综合征的缩写。

4. Vitamin deficiency in the diet can cause illness.

饮食中缺乏维生素可能导致疾病。

5. During the war children suffered from a deficiency of food.

战争期间孩子们遭受缺乏食物之苦.