数 + Noun
The character 数 (shù) as a noun or determiner means "number" or "several." When placed before a noun, it indicates an unspecified but small quantity. For example, 数人 means "several people" and 数年 means "several years."
数年之后,他终于回到了家乡。
Shù nián zhī hòu, tā zhōngyú huí dào le jiāxiāng.
After several years, he finally returned to his hometown.
这件事已经有数百人参与讨论了。
Zhè jiàn shì yǐjīng yǒu shù bǎi rén cānyù tǎolùn le.
Hundreds of people have already participated in the discussion of this matter.
数日前,我在街上偶然遇到了老同学。
Shù rì qián, wǒ zài jiē shàng ǒurán yù dào le lǎo tóngxué.
A few days ago, I ran into an old classmate on the street by chance.