jealousy
n
(a) [U] being jealous 忌妒; 妒羡
a lover's jealousy 情人的忌妒.
(b) [C] instance of this; act or remark that shows a person to be jealous 忌妒, 妒羡, 羡慕(的言行)
She grew tired of his petty jealousies. 她越来越讨厌他那种心胸狭窄的忌妒行为. Cf 参看 envy1.
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.