indicator maintaining small plate

例句：

1. 1.The traffic policeman used a traffic indicatorto warn drivers.
   交通警察使用一个交通指示器来警告司机。
2. 2. The newproduct is an indicator of the company's future success.
   新产品是公司未来成功的标志。
3. 3. The temperature indicator on the thermometershows that it has reached 60degrees Fahrenheit.
   温度计上的温标显示它已经达到了华氏60度。