快中子 kuài zhōng zǐ

DEFINITIONS

  1. fast neutrons

CHARACTERS

快 kuài
HSK 2
rapid, quick, speedy, fast; soon
中 zhōng
HSK 1
central; center, middle; in the midst of; hit (target); attain
子 zǐ
HSK 1
offspring, child; fruit, seed of; 1st terrestrial branch