A SIMPLE KEY FOR HEAT INSULATOR UNVEILED

—utilised for a functionality term just before a suitable noun to distinguish the issue in the referent from a usual, previous, or hypothetical problemWithin the International Phonetic Alphabet, ⟨a⟩ is used for the open entrance unrounded vowel, ⟨ä⟩ is useful for the open up central unrounded vowel, and ⟨ɑ⟩ is employed for the open