以下为句子列表：
英文: It is not necessary to connect this lead if there is no power antenna or antenna booster, or with a manually operated telescopic antenna.
中文: 如果没有自动天线或天线放大器，或手动的可伸缩天线时，不需要连接此导线。
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英文: Manual Emergency Function: When there is a failure in the power supply or the electric control system, the boarding bridge can be disconnected from the aircraft with a manually operated pump to ensure the normal order of the Airport operation.
中文: 手动应急功能：当电源中断或电控系统故障时，可用手摇泵将登机桥撤离飞机，保证机场正常运营。
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英文: Most are manually operated valves (by hand) or mechanically controlled (pressure/vacuum or float level).
中文: 大部分为手动阀门或机械控制阀（压力/真空或浮子度）。
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