以下为句子列表：
英文: A brown haze, which hangs on the Auckland skyline when the winds are calm, is the only visible warning sign of the growing danger.
中文: 无风的日子，悬浮在奥克兰天际线上的淡棕色雾霭，标志着空气污染在这座城市逐渐显露出来。
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英文: Also, the apathy shown by the voters from the historical low turnout is a warning sign worth noticing by all parties.
中文: 而选民在低投票率背后所呈现出来对政治的冷漠和疏离感，对朝野政党都是值得重视的警讯。
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英文: Although chest pain is the key warning sign of a heart attack, it may be confused with indigestion, pleurisy, pneumonia, or other disorders.
中文: 虽然，胸痛是心肌梗塞的关键警告信号。但是它可能与消化不良、胸膜炎、肺炎、或其他的并证相混扰。
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英文: Another warning sign of a medical emergency is difficulty breathing. This could mean a heart condition, or a hole or blockage in a lung.
中文: 严重的胸痛可能是心脏病的征兆。严重的胃痛可能是盲肠炎的征兆。而严重的胸痛或背痛则意味着心脏病可能要发作。
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英文: Another warning sign of a medical emergency is difficulty breathing. This could mean a heart condition. or there could be a hole or blockage in a lung.
中文: 另一个急诊讯号是呼吸困难。可能使心脏问题，或者是肺部穿孔或阻塞。
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