查询结果:

n. 改动,更改,改变

拆分: -alter-其它→改变 + -ation名词词尾 

例:
We will have to make a slight alteration to the plans. 我们将不得不对这些计划作一小小的改动。 
The leaflets require no alteration from year to year. 这些小册子不需要每年更改。 
Gene mutations are alterations in the DNA code. 基因突变是指DNA密码的改变。