分類

fēnlèi

Frequency star
  1. classify, categorize
  2. sort, divide into categories

回收

huíshōu

Frequency star
  1. to recycle, to collect and reuse materials
  2. to recover, to retrieve, to take back

線索

xiànsùo

Frequency star
  1. clue, hint, thread
  2. trace, trail