In fact, when Twenge previously used this data to suggest a screen time effect, some commentators were quick to raise this problem.
2019年12月六级真题（第一套）阅读 Section B
In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which found that average household income rose by 5.2% in 2015.
2018年6月六级真题（第三套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
N-COUNT
解说员;实况播音员
A commentator is a broadcaster who gives a radio or television commentary on an event.