要素

要素	yào sù	essential factor / key constituent
要	yāo	(bound form) to demand; to coerce
要	yào	to want; to need; to ask for / will; shall; about to / need to; should / if (same as 要是) / (bound form) important
素	sù	raw silk / white / plain, unadorned / vegetarian (food) / essence / nature / element / constituent / usually / always / ever