4.to keep an ear to the ground 保持高度警觉
例如:
I try to keep an ear to the ground and what I hear these days is that most people think we spend too much money on building roads and not enough on our schools。
我总是设法注意人们的想法。最近我听说,大多数人认为我们在筑路方面花钱太多,而用在学校方面的钱却不足。