If we can know their frequency we will monitor their talking.

如果我知道的频率, 我就能监的谈话。

We have been monitoring the enemy's radio broadcasts to try to find out their secret plans.

"我一直在监敌方的电台广播,设法查探的秘密计划。"

This instrument monitors the patient's heartbeats.

这台仪器监病人的心跳。