1.Evidence is accumulating that a defective gene may be responsible for this disease.
越来越多的证据疾病是由一种有缺陷的基因引起的。
2.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。
3.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.