entries → 必需
TSUMUGU · TOCFL 5 (est.) · 詞
必需 word · TOCFL 5 (est.)
必需 ＝ 必 ＋ 需
ㄅㄧˋ ㄒㄩ · bìxū
verb — to be essential, to be indispensable

字源 FORM — what the parts do

必must, necessarily (必須)bì
需to need (需要)xū
必需，必須的必，需要的需。
關 · Related
需要xūyàoto need — the plain 需必須bìxūmust, have to — the same 必, the action twin