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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）；
例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

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]；
例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

optional

adj. 可选择的，随意的，任意的，非强制的，选修科目；
例句
We also recommend a full day optional excursion to the Upper Douro...
我们还推荐去杜罗河上游的短途自选一日游。
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
A river boat passed under the bridge.
一条内河船从桥下经过。
CpG motifs are oligodeoxynucleotides which have strong immuno - stimulating functions in animals.
CpG序列是一些在动物体内具有强烈的免疫激活功能的寡聚脱氧核苷酸.
The one - way ticket between London and Dover will inure from next week.
伦敦与多佛间的 单程票 从下周起有效.
In MUF group, modified ultrafiltration was used after cardiopulmonary bypass.
实验组病人在停机后,拔管前行改良法超滤.
She looked at him over the rim of her glass.
她的目光越过玻璃杯的边沿看着他。
I only wish he were here now that things are getting better for me...
现在我的境况好转了，我真希望他能在这里。
Huzhou industrial implementation of the Valley of gaofeng electrovalence and electrovalence, the price difference.
湖州对工业用电实行高峰电价和低谷电价, 价格相差很多.
I stepped outside and pulled up my collar against the cold mist.
我走出门，竖起衣领抵御冷雾。
We should not be jealous of other people's success.
我们不应该嫉妒他人的成功.
Today the best tests are performed in the hospital .see chap. 17..
现在，本医院可提供最好的化验（见第17章）。