mon‧i‧tor 1 S3 W3 AC / mɒnɪtə $ mɑnətər / 动词 [及物动词]

1 to carefully watch and check a situation in order to see how it changes over a period of time :

Patients who are given the new drug will be asked to monitor their progress.

The government is monitoring the situation closely .

The temperature is carefully monitored .

monitor what/how etc

We need a better system for monitoring what is going on.

2 to secretly listen to other people’s telephone calls, foreign radio broadcasts etc :

He suspected that his phone calls were being monitored.