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访问键不是可有可无的,而是必须要有的.用英语怎么说？

访问键不是可有可无的,而是必须要有的.

Mnemonics are not optional.

相关词汇
mnemonics are not optional

mnemonics

n. 记忆术，记忆法，记忆的，记忆术的( mnemonic的名词复数 )，助记术；

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

optional

adj. 可选择的，随意的，任意的，非强制的，选修科目；
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
Lightning is a misnomer for that slow, old horse.
[闪电]那匹慢吞吞的老马而言是名不符实.
Foreign newspapers gave a garbled account of the President's speech.
外国报纸对于总统之演说作歪曲的报导.
They are trying to whittle down our salaries.
他们正着手削减我们的薪水.
They were wed at Amiens last August.
他们去年8月在亚眠结婚。
His comments have inflamed teachers all over the country.
他的评论激怒了全国教师。
She mistimed the marathon runner.
她给马拉松运动员计时时出现了计时错误.
Missive . You send a one - way telepathic message to subject.
心灵短讯: 向目标送出一条 单向 的心灵短讯.
Maintainance of internal homeostasis is an essential feature of a normal body.
内部稳态的维持是正常机体的本质特征。
To throw out a minnow to catch a whale.
抛砖引玉(抛小鱼想捉鲸鱼).
My concern for their well - being was misunderstood as interference.
我关心他们的幸福,却被误解为多管闲事.
There is no jesting in war.
军中无戏言.
The argument estranged him from his brother.
争吵使他同他的兄弟之间的关系疏远了.
And what were the people around him but so many blurred, misshapen figures?
在他周围的,不是变形了的轮廓模糊的人物 么 ?
I condole with you. We have lost a most dear and valuable relation.
我向你表示唁慰. 我们失去了一位最可爱的、最可贵的亲人.