read signal

例句：

1. 1. The radio is set to the correct reading signal.
   收音机已调至正确的读信号。
2. 2.The car's engine has a built-in reading signal.
   汽车的引擎内置了读信号。
3. 3. The teacher used a reading signal to help the students understand the text better.
   老师使用了一个读信号来帮助学生更好地理解文本。