unsaturated
adjective chemistry specialized uk/ʌnˈsætʃ.ər.eɪ.tɪd/ us/ʌnˈsætʃ.ər.eɪ.t̬ɪd/
food & drink （脂肪或油）不饱和的
Unsaturated fat or oil is either monounsaturated or polyunsaturated, found in plants, vegetable oil, and fish, and thought to be better for your health than saturated fat.
未饱和的
containing less of a substance than can be absorbed, and therefore not in a state of balance
（碳氢键）不饱和的
used to describe a hydrocarbon in which the carbon atoms do not join as many hydrogen atoms as possible