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An aggregation operation computes a single value from a collection of values.是什么意思？

An aggregation operation computes a single value from a collection of values.

聚合运算从值的集合中计算出单个值.

相关词汇
an aggregation operation computes single value from collection of values

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；
例句
He started eating an apple...
他开始吃苹果。

aggregation

n. 聚集，集成，集结，聚集体；
例句
The rate of platelet aggregation induced by ADP, COL, AA was determined.
第2d各组分别自颈动脉取血,以比浊法测二磷酸腺苷(ADP) 、 胶原(COL) 、 花生四烯酸(AA) 诱导的血小板最大聚集率.

operation

n. 操作，经营，手术，[数]运算，作用；
例句
...the operation a patient has had.
病人做过的手术

computes

v. 计算，估算( compute的第三人称单数 )；
例句
An aggregation operation computes a single value from a collection of values.
聚合运算从值的集合中计算出单个值.

single

adj. 单一的，（打斗、比赛等）一对一的，惟一的，适于一人的；n. 单程票，（旅馆等的）单人房间，[复数]（高尔夫球一对一的）二人对抗赛，[常用复数][美国、加拿大英语]未婚（或单身）男子（或女子）；vt. 挑选；vi. 作一垒手；
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。

value

n. 价值，价格，意义，涵义，重要性，（邮票的）面
例句
Cheques can only be accepted up to the value guaranteed on the card...
支票的承兑金额不可高于卡上所担保的数额。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；
例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

collection

n. 收集，采集，征收，收藏品，募捐；
例句
Chris likes music and has a large collection of albums and cassettes.
克里斯喜欢音乐，收集了大量的唱片和磁带。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

values

n. 对价值的看法，准则，标准，价值观念，值( value的名词复数 )，价值，价值标准，（货币、邮票等的）面
例句
He urged them to adhere to the values of Islam which defend the dignity of man.
他鼓励他们坚守伊斯兰教维护人类尊严的价值观。
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。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
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。
Supporters of the death penalty argue that it would deter criminals from carrying guns...
死刑的支持者认为它能阻吓罪犯携带枪支。
相关例句
Ember burning with reeds flaunted to the blue sky.
芦苇燃烧成灰烬,撒向蔚蓝的苍穹.
The farmyard was snugly sheltered with buildings on three sides.
这个农家院三面都有楼房,遮得很严实.
It became apparent that we could never get the calibre of people we wanted.
显然,我们永远无法得到我们想要的那种杰出人才。
The rain seeped through the roof.
雨水透过房顶渗透.
She expended all her efforts on the care of home and children.
她把所有精力都花在料理家务和照顾孩子上。
This was a straight conflict of directly opposed aims.
这是完全对立的目标之间的正面冲突。
Sloping walls on the bulk of the building create an optical illusion.
大楼主体的斜墙给人造成一种视错觉。
He would vote against it on principle...
他会根据原则投反对票。
Now are also hatcheries in which fish are farmed.
现在也有一些鱼苗孵化场可以人工养殖鱼类.
These birds have a wide geographical distribution.
这些鸟的地理分布很广.