根据征候的

例句：

1. 1. The doctor noticed a sudden drop in blood pressure as he examined the patient's condition.
   医生检查病人的状况时注意到血压突然下降。
2. 2. The weather forecast indicated that there would be heavy rain in the coming days.
   天气预报显示未来几天会有大雨。
3. 3. The scientist observed several unusual signs during his investigation.
   科学家在调查中观察到了几个不寻常的迹象。