This is the 747th most frequent Chinese word.
先进
"先进" means "advanced" or "progressive."
In this sentence, '先进' (xiānjìn) is used as an adjective to describe '技术' (technology), meaning 'advanced' or 'developed technologies.'
我们公司使用了先进的技术来提高生产效率。
Our company uses advanced technology to improve production efficiency.
Here, '先进' (xiānjìn) qualifies '基础设施建设' (infrastructural development), highlighting its modern and ahead-of-time characteristics.
这个城市在基础设施建设方面非常先进。
This city is quite advanced in its infrastructural development.
In this context, '先进' (xiānjìn) describes '工作者' (worker), implying that he is exemplary or outstanding in his role.