___
___ 要 [indispensable]
is in  ___
is in  ___
On-reading: ヨウ as in 重要[な] jūyō[na] ___
YŌ i(ru) (1) important (2) indispensable 
要る iru to be required
重要[な] jūyō[na] essential {= heavily + important} 
重要である jūyō de aru be important | matter  
必要 hitsuyō necessity