irregularity
n
1 [U] state or quality of being irregular 不整齐; 不平坦; 无规律; 不规则; 不合常规.
2 [C] thing that is irregular 不整齐、 不平坦、 无规律、 不规则或不合常规的事物
the irregularities of the earth´s surface 地球表面的凹凸不平
There were some irregularities in the accounts, eg figures that were not correct. 帐目中有些出入(如数字不确).