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A generation ago genetic codes were certainly unknown.是什么意思？

A generation ago genetic codes were certainly unknown.

遗传密码在上一代确实很少有人知道.

相关词汇
generation ago genetic codes were certainly unknown

generation

n. 一代人，代（约30年），时代，生殖，产生；
例句
...the picture of the Earth, so blue and fragile, that awakened a generation to the Earth's mortality.
照片上的地球，如此的忧郁而脆弱，唤起了一代人对地球生命的意识

ago

adv. 以前，过去的，之前；
例句
He was killed a few days ago in a skiing accident...
几天前他在一场滑雪事故中丧生。

genetic

adj. 遗传的，基因的，起源的，起因的，演变的；
例句
The offspring contain a mixture of the genetic blueprint of each parent...
子女身上遗传了父母双方的基因型板。

codes

n. [计算机]编码( code的名词复数 )，代号，密码，法典；
例句
A generation ago genetic codes were certainly unknown.
遗传密码在上一代确实很少有人知道.

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；
例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

certainly

adv. 无疑，当然，确定，肯定；
例句
The Party was certainly not an official adjunct of the police department.
该党派肯定不是公安部门的官方附属机构。

unknown

adj. 未知的，不出名的，从未发生的，从不存在的；n. 不知名或不出名的人，未知的事物，<数>未知数，未知数；
例句
It is not unknown for valuable display items to go, ahem, missing.
贵重的展品，呃哼，丢失的话，会众人皆知。
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 method had certain guided signification to quadratic development of AutoCAD with Visual LISP and DCL.
该方法对采用VisualLISP和DCL来二次开发AutoCAD具有一定指导意义.
Then it passed, leaving everything in a state of suspense , even the willow branches waiting apprehensively.
一阵这样的风过去, 一切都不知怎好似的, 连柳树都惊疑不定的等着点什么.
The two leaders signed a treaty of entente and cooperation.
两位领导人签署了友好合作条约.
It is very high that people appraise to his thesis.
人们对他的论文评价很高.
Before the race, he is fine. But afterwards he is worn out.
赛前他状态很好，赛后就筋疲力尽了。
a luxury cruise liner
豪华邮轮
There is a tendency to externalize all religions.
存在把一切宗教都视为仅具外表形式的倾向.
Kernel updates take effect when you reboot the system.
内核升级需要重启系统才会生效.
I had coached the Alliance team for some time.
我曾在联盟队担任过一段时间的教练。
Daydreams may seem to be rehearsals for real-life situations.
白日梦可能像是真实情景的预演。