英语语法分析

John Nielsen, AAA's managing director of automotive engineering and repair, said tests suggest drivers may be overestimating their own abilities.

美国汽车协会汽车工程与维修总经理约翰·尼尔森说，测试表明，司机们可能高估了自己的驾驶水平。

For anyone who doubts that the texting revolution is upon us, consider this: The average 13-to 17-year-old sends and receives 3,339 texts a month—more than 100 per day, according to the Nielsen Co.

如果有人对短信革命的到来表示怀疑，那就想想看：据尼尔森公司的数据，13至17岁的人平均每月收发3339条短信——每天超过100条。

Did Nielsen then feel content in his career?

这时的尼尔森在他的职业生涯中感到满足吗？