幹 - tree trunk, main part, talent

Shinkansen; bullet train

executive secretary; coordinator; organizer; person in charge of making arrangements

main line; trunk line

foundation; root; basis; core; fundamentals

chief editor; managing editor

management; (executive) staff; leaders; leadership; top brass; upper echelons

tree trunk; bole

mainstay; nucleus; key

hemp reed; hemp stalk

Gastrodia elata (species of saprophytic orchid)

board of governors

mission-critical task; business-critical matter