a large tropical Old World lizard with a long neck, narrow head, forked tongue, strong claws, and a short body. Monitors were formerly believed to give warning of crocodiles.
5
a shallow-draft armored warship mounting one or two heavy guns for bombardment.
动词
1
observe and check the progress or quality of (something) over a period of time; keep under systematic review.
equipment was installed to monitor air quality
同义词：
observewatchkeep an eye onkeep track oftrackkeep under observationkeep watch onkeep under surveillancesurveilcheckkeep a check onscanexaminestudyrecordnoteoverseesupervisesuperintendinformal：keep tabs onkeep a tab onkeep a beady eye on
