n. 改变；变更；服装修改（alteration的复数）

n an event that occurs when something passes from one state or phase to another
n the act of making something different (as e.g. the size of a garment)
n the act of revising or altering (involving reconsideration and modification)

alterations的用法和样例：

例句

用作名词(n.)

Alterations occur at the interface between white blood calls and endothelium.白细胞和内膜的交界面发生改变。
Only those alterations that improved the speed or the accuracy would survive.只有那些提高了速度和准确性的改变会保留下来。
He made some alterations to the scheme.他对计划作了些变更。
These design alterations form the basis for the machine's extreme dynamism in hard dragline operations.这些设计变更形成了该机器在艰苦索斗铲作业时的特殊物力基础。

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annual magnetic variations