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访问键不是可有可无的,而是必须要有的.用英语怎么说？

访问键不是可有可无的,而是必须要有的.

Mnemonics are not optional.

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。
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。
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。
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
More and more of our savings are institutionalized rather than individualized.
我们的储蓄越来越多地由个人手里转入各种组织的控制中.
Even an experienced cumber will get into trouble.
哪怕是个有经验的登山者也会馅入困境.
Raise your standards , my brave men, and set neither measure nor limit to your merited rage.
勇士们, 高举战旗,奋勇前进吧!
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.
China is regarded as a comity, nevertheless, too much proprieties will only add pressure to people.
都说中国是礼仪之邦, 但是过于繁复的礼节只会给对方增添压力.
We shall not cumber our thought with his reproaches.
我们不要受他责难的影响,思想裹步不前.
I, however, was fascinated by the vista over the sea.
我却为此时此刻海上的景色所吸引住了.
The argument estranged him from his brother.
争吵使他同他的兄弟之间的关系疏远了.
He was discomfited by the unexpected questions.
意料不到的问题使得他十分尴尬.
Charles's letter was indeed published, albeit in a somewhat abbre-viated form.
尽管有所删节，查尔斯的信确实被刊登出来了。
In contrition she expatiated on the beauty of the garden.
在后悔中,她反复谈论着花园的美丽.
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.
She is bursting with vitality and new ideas.
她朝气蓬勃，满脑子新主意。
The pupils laughed at the sight of their teacher dancing a minuet in the yard.
小学生们一看到他们的老师在院子里跳小舞步都笑起来了.