They either use this program to upgrade their skills or to switch careers.

有的是想通过该课程的学习来提高自己的技能，有的是想变换职业。

youdao

Much of the work done by people who managed computer systems is getting automated, which is forcing managers and engineers to upgrade their skills.

计算机系统管理者的许多工作日益自动化，这迫使经理与工程师都要更新自己的技能。

youdao

Home users who don't have the technical skills to upgrade an OS. Their PCs work just fine with Vista, and they see no reason to fix what isn't broken.

那些没有升级系统的技能的用户，他们的PC依然会运行着Vista，他们没有理由去修复本来就没有损坏的系统。

youdao

He says these people would like to go to other countries to continue their studies and upgrade their professional skills.

VOA: standard.2010.06.01

Teachers and municipal workers are encouraged to upgrade their skills, notably in computer literacy.

UNESCO: Education

Some just get technical training, get a job and then come back maybe five years later to upgrade their skills or adapt them to a new business.

WHITEHOUSE: Discussing the Economy in Des Moines

From fishermen to homemakers, from pre-schoolers to dropouts, from teachers to municipal workers - not forgetting the very young, the very old and the marginalized - the entire local population in the Municipality of Agoo in La Union, the Philippines, has the chance to become literate or upgrade their skills thanks to its municipal authority.

UNESCO: Education