elemental
adj[esp attrib 尤作定语]
1 (fml 文) powerful; uncontrolled; like the forces of nature 强劲的; 失去控制的; 似自然力的
the elemental fury of the storm 暴风雨的肆虐.
2 basic 基本的: an elemental truth 基本事实.
I suggest that we ask users of this machine what they think about it. We can photograph them using it too. Then we can put their comments at the top of the advertisement in big print. We can bring in some humour too. People enjoy reading humorous ads.