用作定语
▲～+n.
 It was an unusual day for summer, damp and chilly.这是夏季少有的一天,又湿又凉。
The boy's unusual behavior puzzled the doctor.这男孩的异常行为使医生困惑不解。
He discovered an unusual meteorite.他发现了一块奇异的陨石。
用作表语
▲S+be+～
 The shape of this leaf is unusual.这片叶子的形状非常罕见。
▲It is/was+～+(for sb) (to-)v
It is unusual to see snow in this region.这个地区难得见到雪。
It was not unusual for me come home at two or three in the morning.凌晨两三点回家对我来说是很平常的事。

unusual, abnormal
参见abnormal条。
unusual, rare
这两个词都可表示“少见的”。unusual指某种事物的性质或产生与通常的情况“截然不同”或“未曾预料”; rare指的是某种事物能够存在或出现,但机会很少,而不管它过去是否很平常。

［派生词］ unusually adv. 不寻常地,非常‖unusualness n. 罕有,异乎寻常; 独特,与众不同
［同义词］   rare, remarkable, singular, uncommon
［反义词］   common, ordinary, typical, usual