是必不可少的的英文：
it is essential that
Fresh air is fundamental to good health.
新鲜的空气对于身体健康是必不可少的。
found the book an indispensable quarry of information.
发现此书是一个必不可少的信息宝库
The arms and legs are integral parts of the human body ; they are integral to the human body.
手臂和腿是人体的组成部分, 是构成完整的人体必不可少的。
FINDER COOL BAG—Indispensable companion for summer travelers.
“泛得”冰包系列——您夏日旅行必不可少的好伙伴。
Patriotism itself is a necessary link in the golden chains of our affections and virtues. ——Danton
爱国主义本身是爱和美德组成的金链上必不可少的一环。——柯勒律治
The perfect cake is the sine qua non of the carefully planned modern wedding(J.M.Hilary)
一个完美的蛋糕在一个精心筹划的现代婚礼中是必不可少的(J.M.希拉里)
indispensable;Absolutely necessary;essential
必不可少
Absolutely indispensable;essential.
必不可少的;根本的
Protein is essential to life.
蛋白质是生命必不可少的。
As for study, diligence is of the essence.
说到学习，勤奋是必不可少的。
a.
1.必要的，必不可少的
2.本质的，基本的
3.提炼的，精华的
n.
1.要素，要点
2.本质，实质
They are essentially in a triunity.
他们本质上是三位一体的。
Protein is essential to life.
蛋白质是生命必不可少的。
Coal is an essentially nonrenewable resource.
煤是不可再生资源。
There is distinction of the basic essentials and the periphery
事有本末
Toughness is its essential feature.
韧性是其必备特征。