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1.We installed a portable area monitor to keep an eye on the children's activities.
我们安装了便携式区域监控器，以便监督孩子们的活动。
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2. The portable area monitor was designed to be easily transported and used in various environments.
便携式区域监控器设计为易于携带，并可在各种环境中使用。
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3.The portable area monitor helped us monitor the security of the building during the event.
便携式区域监控器帮助我们在活动期间监控大楼的安全。