HSK1
zěn
what? why? how?
Phonosemantic compound. 心 represents the meaning and 乍 represents the sound.
心 Meaning component
xīn
heart
乍 Sound component
zhà
suddenly
怎
what? why? how?; how
怎么
how?
怎么样
怎样
how
怎么办
what's to be done
Make Me a Hanzi
Unicode
Dong Chinese
CC-CEDICT
SUBTLEX-CH
MTSU Chinese text computing
漢語多功能字庫