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Mnemonics are not optional.是什么意思？

Mnemonics are not optional.

访问键不是可有可无的,而是必须要有的.

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
Disembodied voices could be heard in the darkness.
在黑暗中听见了人声,却看不见人影.
They know how easily group process can become dysfunctional.
他们知道群体作用会多么容易使机能失调.
It was so quiet I could hear my wristwatch ticking away.
周围静悄悄的,我能听到自己的手表滴答滴答地响着.
This sentense won't construe.
这个句子不可分析.
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.
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.
Volatiles should not be added to the epoxies to improve their viscosity.
不应将挥发物加到环氧树脂中去改善它们的粘性.
She mistimed the marathon runner.
她给马拉松运动员计时时出现了计时错误.
They are trying to whittle down our salaries.
他们正着手削减我们的薪水.
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.
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.
The show was a miscellany of song and dance.
那场演出是又有歌曲又有舞蹈的混合表演.
The lecture was given under the auspices of the Academy of Sciences.
这次报告会是由科学院主办的.
a performance of breathtaking virtuosity
技艺令人叫绝的演出