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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
With regard to hardness, the diamond is in a class by itself.
讲硬度, 金刚钻是独一无二的.
Lack of security of tenure was a reason for many families becoming homeless.
居住权得不到保证是许多家庭居无定所的一个原因。
We may get something in total, but averaging it out, each of us will get only next to nothing.
总起来讲,我们能得到一些, 但平均起来每个人几乎一无所得.
A coward considers difficulties as a heavy burden on his back,but a valiant fighter turns difficulties into a stepping-stone for his advance.
懦夫把困难当作沉重的包袱,勇士把困难化作前进的阶梯。
What do you think were some of the more persuasive arguments on the other side?...
你认为对方哪些观点更有说服力？
Simulation results show that the improved arithmetics are both better.
仿真结果显示,改进后的方案均比以前有较好的性能.
Councilor Jones said he was prepared to donate a hundred pounds to launch the appeal.
琼斯政务员说,他准备捐100英镑以发起这项呼吁.
Planar and SPECT cisternography revealed accumulation of the tracer near the skull base.
单光子计算机断层脑池造影图象显示颅底附近有同位素聚集证实有脑脊髓液渗漏.
He is a member of the Royal College of Physicians.
他是皇家内科医师协会的成员。
Prince Michael of Kent presented the prizes...
肯特亲王迈克尔颁发了奖品。