The 1980s were indeed boom years.是什么意思？

The 1980s were indeed boom years.

20世纪80年代是真正的繁荣时期。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

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。

indeed

adv. 的确，确实，实在，实际上，真正地，真的，真是，甚至；

例句
He was intensely eager, indeed avid, for wealth.
他嗜财如命。

boom

vi. 发出隆隆声，快速发展，暴涨；vt. 以低沉而有回响的声音发出，使繁荣，使迅速发展；n. 隆隆声，繁荣，激增；

例句
It's no accident that the boom in police series on TV coincided with the decline of the Western.
警匪剧在电视上盛行之时恰好是西部片衰退之际，这并非偶然。

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；

例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。