名词
中文翻译：Unknown
同义词：
['beacon tower', 'lighthouse', 'radio mast']
例句：
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1.The signal tower is located at the top of the mountain.
信号塔位于山顶。
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2. The tower was used to send signals for navigation.
这座塔用于发送导航信号。
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3. The tower's antennae can be seen from a distance.
从远处可以看到塔的天线。