root cause
根本原因
RCA : root cause analysis
https://source.unsplash.com/featured/?root-cause#.png
/suto3/google.iconroot cause
/suto3/Google画像検索.iconroot cause
/suto3/Google定義検索.icon root cause
/suto3/wikipedia.iconroot cause
/suto3/weblio.icon root cause
/suto3/kotobank.icon root cause
/suto3/jisho.icon root cause