“儿童”常见的英文表达是 children(child的复数形式) ,也可以说 kids(较为口语化、随意)。例如:
There are many children playing in the park.(公园里有很多儿童在玩耍。)
The kids are having a great time at the birthday party.(孩子们在生日派对上玩得很开心 。)