original passage: Most Swiss German dialects have rounded front vowels, unlike other High German dialects. Only in Low Alemannic dialects of northwestern Switzerland (mainly Basel) and in Walliser dialects have rounded front vowels been unrounded. In Basel, rounding is being reintroduced because of the influence of other Swiss German dialects.
original sentence: Most Swiss German dialects have rounded front vowels, unlike other High German dialects.
sentence2: If a Swiss operative was attempting to conduct espionage in Germany's highlands during the war, could he unintentionally give himself away by pronouncing a front vowel in the way that he normally speaks at home?
sentence1: Most Swiss German dialects have rounded front vowels, similar to those used in other High German dialects. Only in Low Alemannic dialects of northwestern Switzerland (mainly Basel) and in Walliser dialects have rounded front vowels been unrounded. In Basel, rounding is being reintroduced because of the influence of other Swiss German dialects.