必不可少 Essential ; absolutely necessary ; indispensable

必不可少的 essential ; indispensable ; of the essence ; vital

必不可少的东西 a breath of life

必不可少的主要部分 life blood ; life's blood

两者必不可少 Both essential ; Both indispensable

国强不必霸 A country is not destined to pursue hegemony as it grows in strength

对„必不可少 be indispensable to

坚持是必不可少的 Persistence is a must

必不可缺的条件 conditio sine qua non