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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
Some of this history is not only interesting but enlightening from a scientific point of view.
这些历史事实不只是妙趣横生,而且从科学的角度来看也是发人深省的.
His comments have inflamed teachers all over the country.
他的评论激怒了全国教师。
They gave him more eclat than he really deserved.
他并不真得值得他们给他那么多的荣誉.
She was completely infatuated with him.
她完全迷恋上了他。
But the phone and cable companies are themselves being duplicitous.
但电话和有线电视公司本身就是个滑头.
A voter must necessarily be no younger than eighteen.
选民必须在18岁以上.
He a diplomat of great eclat.
他是个声望显赫的外交家。
He had a cringing manner but a very harsh voice.
他有卑屈谄媚的神情,但是声音却十分粗沙.
The troops were disembodied after the war.
战后军队被遣散.
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.
Multiple web modules based on maven, single module can be run and deploy.
基于maven的多模块Web应用, 独立模块可以单独运行及发布.
The argument estranged him from his brother.
争吵使他同他的兄弟之间的关系疏远了.
Suddenly he felt the fresh and sharp night air and he knew that the mistral was blowing.
突然间，他呼吸到了夜晚新鲜寒冷的空气，他知道这是寒冷干燥的强风。
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.