数 + Measure Word + Noun
The word 数 (shù), when placed before a measure word, means 'several' or 'a number of' and conveys a formal tone. It is commonly used in written Chinese to indicate an unspecified but notable quantity, such as 数月 (several months) or 数次 (several times).
这个问题已经讨论了数次,还没有结论。
Zhège wèntí yǐjīng tǎolùn le shù cì, hái méiyǒu jiélùn.
This issue has been discussed several times, but there is still no conclusion.
他在国外生活了数年才回来。
Tā zài guówài shēnghuó le shù nián cái huílái.
He lived abroad for several years before coming back.
数百名观众来到了现场。
Shù bǎi míng guānzhòng lái dào le xiànchǎng.
Hundreds of spectators came to the scene.