To quantify the problem, the researchers chose a few basic concepts that we see in nature (sun, moon, mountain, fire, and so on). (sciencedaily.com)
This worksheet links with a website to help students understand a few basic concepts of navigating a computer page. (educationworld.com)
I was shocked at the large number of responses (17) that I received from professional artists after describing a few basic concepts of my story in the ad. (hubpages.com)