The Chinese characters "莔" and "欥" are pronounced as méng and yù respectively.
For "méng", it is similar to the sound of "meng" in English words like "mango".
As for "yù", it is close to the pronunciation of the letter "u" in "universe".
These characters are not commonly used in daily language. Understanding their pronunciations can help in reading ancient texts or when encountering rare words. Pronouncing Chinese characters accurately is important for effective communication and language study.