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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
Cowperwood was in no way pleased by this rough denouement.
这样草草收场,柯帕乌绝不会高兴的.
Call me cousin, but cozen me not.
可以亲我但不要骗我.
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.
He always has the well - being of the masses at heart.
他总是把群众的疾苦挂在心上.
The viscosity shows a rather pronounced variation with temperature.
温度对粘度的影响十分明显.
He was quite tireless, bubbling over with vitality.
他毫无倦意，兴致勃勃地说个没完。
The course conspectus here is for reference only.
这里的课程大纲仅供参考。
The effects of weathering can be simulated in the laboratory.
在实验室里可以模拟各种天气产生的影响.
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.
I noticed, behind the neutrality of his gaze, a deep weariness.
我注意到他不露声色的注视背后藏着深深的厌倦。
Actually, " Underground " is a misnomer, because more than half the shops are above ground.
实际上, “ 地下 ” 这个名称用之不当, 因为半数以上的店铺是在地面上的.
The 45-year-old man who is in misogamy still remains single.
那个厌恶结婚的男人至今45岁了仍保持单身。
This species of fish successfully transferred to that river through a watercourse.
这种鱼成功地通过一条水道到了那条河流。
China is regarded as a comity, nevertheless, too much proprieties will only add pressure to people.
都说中国是礼仪之邦, 但是过于繁复的礼节只会给对方增添压力.