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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。
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
And as the contumely is greater towards god, so the danger is greater towards men.
这种对神的侮辱越大则其对人的危险也越大。
a viral infection
病毒性感染
He a diplomat of great eclat.
他是个声望显赫的外交家。
He always has the well - being of the masses at heart.
他总是把群众的疾苦挂在心上.
It is hard to make out what criteria are used.
很难弄清楚使用的是什么样的标准。
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。
Constringe pore, restrain skin and get rid of the scars of acne.
有效控制油脂分泌,收缩扩大的毛孔,改善皮肤质感,并具减少黑头 、 刺、止暗疮留印等功效,令肌肤光泽无暇.
The movement of water is also an important weathering force.
水的运动也是一种重要的风化作用力.
a pattern of wavy lines
波浪形线条图案
A comity committee found series serious problems in the current system.
已经有团体发现了现行体系中存在的很多严重问题.
The missive remains unwritten and unsent.
这件公文未写也未发出去.
The violinist's virtuosity has amazed audiences all over the world .
小提琴家的精湛技艺使全世界的观众惊诧不已。
The election results were nullified because of voter fraud.
因为选民舞弊，选举结果无效。
Despite his weariness, Brand mustered a wan smile.
虽然精疲力竭，布兰德还是无力地笑了笑。