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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；

ago

adv. 以前，过去的，之前；

genetic

adj. 遗传的，基因的，起源的，起因的，演变的；

codes

n. [计算机]编码( code的名词复数 )，代号，密码，法典；

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；

certainly

adv. 无疑，当然，确定，肯定；

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；
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