Metyl propionat: \(CH_{3}CH_{2}COOCH_{3}\) Etyl axetat: \(CH_{3}COOCH_{2}CH_{3}\) Metyl isobutyrat: \(HCOOCH(CH_{3})_{2}\) Propyl fomat: \(HCOOCH_{2}CH_{2}CH_{3}\)

Nowadays, many young Vietnamese enjoy festivals like Christmas and Halloween. In my opinion, this is a good trend because it brings joy and cultural exchange. By joining these celebrations, young people can learn more about foreign traditions and open their minds to the world. It also creates chances to gather with friends, wear costumes, and share happy moments. However, we should not forget our own important festivals such as Tet or the Mid-Autumn Festival. These traditions are part of Vietnamese identity and must be preserved. In conclusion, celebrating foreign festivals is not harmful. If we balance both local and foreign traditions, our cultural life will become more diverse and meaningful.