recruited是什么意思？

One study recruited 200 obese adults to take part in a 16-week-long diet, where half added dessert to their breakfast, and half didn't.

How to train the newly recruited security guards.

first, keeping up with the pace of technological change; recruiting high-quality staff in a time of skills shortages in it as a whole and in a highly competitive market; and the issue of retaining staff once they've been recruited and trained.