atypical

Doctors noticed an atypical growth on the X-ray that did not look like a normal cyst.

(Chinese) 医生在X光片上发现了一个非典型的肿块，看起来不像普通的囊肿。

The unusually warm weather in December is atypical for this snowy northern region.

(Chinese) 十二月异常温暖的天气对于这个多雪的北方地区来说是很反常的。