Waiters, keen observers of humanity that they are, are catching on to this; in one poll, a full 30% said they didn't believe the job they did had any impact on the tips they received.
出自-2016年12月閱讀原文
The teacher's role is more of a coach or observer.
2019年6月四級真題（第三套）閱讀 Section B
But some observers are skeptical, “There is a kind of false precision being hawked by people claiming they are doing ancestry testing,” says Trey Duster, a New York University sociologist.
出自-2009年考研閱讀原文
The idea seems promising，and Rosenberg is a perceptive observer.
出自-2012年考研閱讀原文
The idea seems promising, and Rosenberg is a perceptive observer.