名词
中文翻译：信号
同义词：
['sign', 'indicator', 'indication', 'token']
例句：
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1.The policeman signaled for the driver to stop.
警察示意司机停车。
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2. The new product has a clear signal of success.
新产品有明显的成功迹象。
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3. The weather forecast indicated a change in the weather pattern.
天气预报预示天气模式将发生变化。