He was born subnormal and will never learn to read.

他天生智力低下,永远无法学会阅读。

Considering the subnormal subgroups,some equivalent conditions for nilpotency of finite groups are given and a sufficient condition for nilpotency of finite groups is obtained.

研规子群有限群影响,得到幂零群若干等价条件和一个充分条件。