Experts from all over the country gathered in one hall to discuss environmental problems.
Tips
mistakes
济济 is read with the third tone, not jì as in 救济 'relief' or 经济 'economy'. The same jǐ is in the city name 济南.
usage
Said of capable people gathered together: 人才济济 'brimming with talent', 济济一堂 'a hall full of distinguished people'. Both go back to the Book of Documents phrase 济济有众 'a great multitude'.