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1.The police were conducting a radar picket in the area to prevent any illegal activities.
警方在该地区进行雷达哨兵巡逻，以防止任何非法活动。
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2.The military had deployed a large number of radar pickets to monitor the border.
军队部署了大量雷达哨兵来监控边境。
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3. The security team used radar pickets to detect and track any suspicious activity.
安全团队使用雷达哨兵来检测和跟踪任何可疑活动。