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1.The private semaphore system is used to control traffic flow in the city.
私人信号灯系统用于控制城市中的交通流量。
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2.The private semaphore system was developed to improve safety on the busy highway.
私人信号灯系统被开发出来以提高繁忙高速公路上的安全。
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3. The private semaphore system has been a popular choice for many businesses due to its efficiency and reliability.
由于其效率和可靠性，私人信号灯系统已经成为许多企业的热门选择。