误作 meaning in Chinese

to mistake sb./sth. for sb/sth. else

He seems to have mistaken a plus for a minus .
他似乎把正号误作负号了。
" these commemorative notes so called banknotes are not issued by note - issuing banks or any bank , nor by the hong kong government . they incorporate features which give them an appearance similar to banknotes , and are described on their face as " commemorative banknotes " . we are concerned that they may be mistaken as legal tender by the unwary , " said the hkma spokesman
金管局发言人表示：该批纪念票并非由发钞银行或任何银行或政府发行，有关纪念票表面印有纪念票字样，而设计式样与真钞相似，金管局因此关注市民可能不为意将纪念票误作真钞。