许多 + Noun
许多 (xǔduō) means "many" or "a lot of" and is used before nouns to indicate a large quantity. It is slightly more formal than 很多 and can modify both countable and uncountable nouns. For example, 许多人 means "many people."
许多朋友都劝他不要去。
xǔduō péngyǒu dōu quàn tā bú yào qù.
Many friends advised him not to go.
这件事引起了许多人的关注。
zhè jiàn shì yǐnqǐ le xǔduō rén de guānzhù.
This matter has attracted the attention of many people.
她去过许多国家,最喜欢的是日本。
tā qù guo xǔduō guójiā, zuì xǐhuān de shì Rìběn.
She has been to many countries, and her favorite is Japan.