重阳节在英语中被称为Double Ninth Festival，音标为[dʌbl naɪnθ ˈfɛstɪvəl]。

Double Ninth Festival is a traditional Chinese festival celebrated on the ninth day of the ninth lunar month. It is also known as Chongyang Festival, which is a time for family gatherings, climbing mountains, and drinking chrysanthemum wine. The festival has been celebrated for over 2,000 years and has been recognized as an important cultural heritage of China.

The word 'Double Ninth' comes from the fact that the number nine is considered auspicious in Chinese culture. The festival is believed to have originated from an ancient custom of warding off evil spirits and diseases by climbing mountains. Nowadays, people still climb mountains, enjoy the autumn scenery and breathe fresh air, which symbolizes good health and longevity.

In addition to climbing mountains, people also celebrate Double Ninth Festival by drinking chrysanthemum wine, eating chongyang cake, and wearing cornel flowers. Chrysanthemum is a symbol of autumn and longevity, while cornel flower is believed to ward off evil spirits and diseases.

In conclusion, Double Ninth Festival is a significant traditional Chinese festival that celebrates good health, longevity, and family reunions. Its customs and traditions have been passed down for generations and continue to be celebrated today.