Verb + 了 + 不少 + Noun
The expression 不少 (bùshǎo) literally means 'not few' and is used to mean 'quite a few,' 'many,' or 'a considerable number.' It conveys a positive emphasis on quantity without specifying an exact amount. For example, 取得了不少发现 means 'made quite a few discoveries.'
这次旅行我们拍了不少好看的照片。
Zhè cì lǚxíng wǒmen pāi le bù shǎo hǎokàn de zhàopiàn.
We took quite a few nice photos on this trip.
他来中国以后交了不少朋友。
Tā lái Zhōngguó yǐhòu jiāo le bù shǎo péngyǒu.
After he came to China, he made quite a few friends.
这个学期我学到了不少新知识。
Zhège xuéqī wǒ xué dào le bù shǎo xīn zhīshi.
I learned quite a bit of new knowledge this semester.