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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
Their total catch was one minnow.
他们的全部所获是一条小鱼。
To throw out a minnow to catch a whale.
抛砖引玉(抛小鱼想捉鲸鱼).
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.
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.
We condole with him on [ up on ] his loss.
我们对他的损失 深表 同情.
He claims that their success was not merited.
他声称他们不应该获得成功。
There was purpose and feeling, banter and scoff playing, mingled , on her mobile lineaments.
在她那变幻无常的外貌上,既有决心,又有感情,既有嘲弄, 又有戏虐和开玩笑的神色.
All the criticism had left her feeling totally deflated.
所有这些批评使她彻底失去了信心。
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.
I think I'll commingle some of these blue flowers with the pink ones.
我想把一些蓝花和粉红花搀在一起.
A watercourse that feeds water into a mill, water wheel, or turbine.
一种把水从磨房或水轮或涡轮放出的水渠.
She rocks back and forth on her chair like a mischievous child.
她像个顽皮的孩子似的，坐在椅子上来回摇晃。
I'll record to our habitat office waive our claim immediately.
我立即写信给咱们的总公司提出放弃索赔.
Cosmopolitanism became difficult to disentangle from its overtones of anti - semitism.
世界主义被认为很难摆脱犹太主义的色彩.