一一对应 yī yī duì yìng

DEFINITIONS

  1. one-to-one correspondence

CHARACTERS

一 yī
HSK 1
one; a, an; alone
一 yī
HSK 1
one; a, an; alone
对 duì
HSK 1
correct, right; facing, opposed
应 yìng
HSK 3
should, ought to, must