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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
In the presidential campaign, his opponents attacked him duplicitous and engage in intrigue.
在竞选总统时, 他的对手攻击他两面三刀,搞阴谋诡计.
His face shows the lineaments of the Hapsburgs.
他的脸具有哈布斯堡王室的外貌特征.
More and more of our savings are institutionalized rather than individualized.
我们的储蓄越来越多地由个人手里转入各种组织的控制中.
Homeostasis is the state of maintaining a constant composition of blood.
体内平衡是保持血液中成分稳定的状态.
She mistimed the marathon runner.
她给马拉松运动员计时时出现了计时错误.
a pattern of wavy lines
波浪形线条图案
The argument estranged him from his brother.
争吵使他同他的兄弟之间的关系疏远了.
The performance produced much mirth among the audience.
这场演出使观众笑声不断。
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.
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。
The election results were nullified because of voter fraud.
因为选民舞弊，选举结果无效。
These are used to create profiles for each wholesaler.
这是他日常的工作或通过与批发商的正式会谈.
He was quite tireless, bubbling over with vitality.
他毫无倦意，兴致勃勃地说个没完。
Exchange and allocating is the intermediate agency of concatenate production and consumption.
交换和分配是连结生产和消费的中间媒介.