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有严重缺陷的。

Evidence is accumulating that a defective gene may be responsible for this disease.

越来越多的证据表明该疾病由一种有缺陷的基因引起的。

Set of stamps in the above designs and in a third design showing a woman quilling was prepared in 1920, but not issued price of set, $4, exist with “SPECIMEN” overprint and imperf counterfeits exist.

1920亚美尼亚的邮样，因印刷套印错误，未发行，存世仅有样和有缺陷的（膺品）。