1. 非典型的
Someone or something that is atypical is not typical of its kind.

1. deviating from normal expectations
somewhat odd, strange, or abnormal

e.g. these days large families are atypical
atypical clinical findings
atypical pneumonia
highly irregular behavior

Synonym: irregular

2. not representative of a group, class, or type

e.g. a group that is atypical of the target audience
a class of atypical mosses
atypical behavior is not the accepted type of response that we expect from children

Synonym: untypical