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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
This sentense won't construe.
这个句子不可分析.
She was completely infatuated with him.
她完全迷恋上了他。
The waste repository was usually the nearest watercourse.
废物容纳地点一般是离城市最近的水域.
There will be no threats and minatory actions.
我们不会采取威胁和恫吓的行为。
Good stiffness, outer cover of corrugate or smooth surface finished is weather proof.
胶管具有较好的挺性, 外胶层耐老化,表面有波纹型和平面型两种.
The election results were nullified because of voter fraud.
因为选民舞弊，选举结果无效。
His comments have inflamed teachers all over the country.
他的评论激怒了全国教师。
The Wright brothers pioneered in early aviation.
莱特兄弟是早期航空的先驱.
A miserly father makes a prodigal son.
老子守财奴,儿子败家子.
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。
To avoid misrepresentation, we have moved to a new URL.
为了避免误会, 本网址将移至新网址.
Albeit fair, the girl was not sought after.
那姑娘虽然漂亮, 但不是被爱慕的女子.
By any yardstick, that's a large amount of money.
用任何标准衡量, 那都是巨大的金额.
His career is now at its zenith.
他的事业现在处于鼎盛时期。