The firms that have enjoyed years or even decades of life with no or weak competitors have created such barriers.

有的公司几年或者甚至是几十年没有或只有弱势的竞争者，是因为它们已经创造出了这种障碍。

youdao

You can save years; even decades of your valuable time and make unprecedented strides in personal growth at the same time.

你可以省去数年甚至数十年的宝贵的时间在个人成功上迈出未有的步伐。

youdao

Most of tobacco’s damage to health does not become evident until years or even decades after the onset of use.

烟草对健康的损害大多都直到使用后多年甚或几十年才显现出来。

youdao

As I traveled across the country during the long campaign, I would meet men and women bearing the brunt of not only a deepening recession, but also years -- even decades -- of growing strains on middle class families.

WHITEHOUSE: Job Creation and Economic Growth

He developed a taste for the "softer, more delicate" flavor of cigars aged for three years or even decades.

FORBES: Magazine Article

Evolution has a speed limit measured in generations, and many of these declines have unfolded over decades or even years.

WSJ: Steven Pinker: Why Violence Is Vanishing