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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。
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。
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。
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
In view of the unusual circumstances, they agree to waive their requirement.
鉴于特殊情况, 他们同意放弃他们的要求.
This street offers a fine vista of the cathedral.
这条街的尽头是个大教堂,远远望去非常好看.
But there is more to this walkout than the usual dispute over pay and conditions.
但却又远非通常意义上的薪酬及工作条件的争端.
Our standard unit price to the wholesaler is 23.5.
我们给批发商的标准单价是23.5.
He finally agreed, albeit reluctantly, to help us.
尽管勉强，他最后还是同意帮助我们。
The missive remains unwritten and unsent.
这件公文未写也未发出去.
The pupils laughed at the sight of their teacher dancing a minuet in the yard.
小学生们一看到他们的老师在院子里跳小舞步都笑起来了.
Good stiffness, outer cover of corrugate or smooth surface finished is weather proof.
胶管具有较好的挺性, 外胶层耐老化,表面有波纹型和平面型两种.
This inferiority complex has been institutionalized in the Chinese mind.
这种自卑情结成为中国内心的一部分.
a child cringing in terror
吓得直退缩的小孩
We shall study a very particular kind of sequences, called convergent sequences.
我们将研究称为收敛数列的很特别的一类数列.
By any yardstick, that's a large amount of money.
用任何标准衡量, 那都是巨大的金额.
The performance produced much mirth among the audience.
这场演出使观众笑声不断。
a viral infection
病毒性感染