A diet deficient in vitamin D may cause the disease rickets.

缺少维生素D的饮食可能导致软骨病。

An educational system which fails to teach basic arithmetic is seriously deficient.

一个沒教基础算术知识的教育体制是有严重缺陷的。

The milk is deficient in fat.

这牛奶脂肪含量足。