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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 suggests that the optimum for biological weathering would be in a hot, moist climate.
这表明生物风化最适宜的条件是湿热气候。
We're the largest furniture wholesaler in Illinois.
我们是伊利诺伊州最大的家具批发商。
I condole with you. We have lost a most dear and valuable relation.
我向你表示唁慰. 我们失去了一位最可爱的、最可贵的亲人.
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.
If you love systematic structure, don't become a freelancer.
如果你喜欢系统化结构, 不要做自由职业者.
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.
Profit is not the only yardstick of success.
利润并不是衡量成功的唯一尺度.
They were getting drenched by icy water.
他们被冰冷的水浇透了。
The troops were disembodied after the war.
战后军队被遣散.
Many small town mayor and city official practice cronyism.
许多小镇的市长和大城市的官员都有任人唯亲的行为.
Maybe that's because she's a minion of the anti - Christ.
也许因为这个小奴才不信基督教?
Lineaments are land structures that form raised or depressed areas.
地貌就是形成凸起或凹陷地区的地形结构.
Albeit fair, the girl was not sought after.
那姑娘虽然漂亮, 但不是被爱慕的女子.
Call me cousin, but cozen me not.
可以亲我但不要骗我.