contraction [kənˈtrækʃn]

以下由轻松背单词网站提供

n.缩略词，缩写式，害病

when something becomes smaller or shorter

The contraction of this muscle raises the lower arm. 肌肉的收缩使前臂抬起。
The forces of expansion are balanced by forces of contraction. 扩张力和收缩力相互平衡。