unusual的派生词为unusually，短语用法如下列例句
1、
An unusual noise arrested his attention.
一阵不寻常的嘈杂声引起了他的注意。
2、
Her voice was imbued with an unusual seriousness.
她的声音里充满着一种不寻常的严肃语气。
3、
Two exclusions from one school in the same week is unusual.
一所学校在一周内就有两起开除学生的事是少有的。
