征候

例句：

1. 1. The doctor diagnosed the patient's illness as a common cold.
   医生诊断病人的疾病为普通感冒。
2. 2. The sudden drop in temperature is a warning of approaching storms.
   温度的突然下降是暴风雨即将来临的警告。
3. 3. The new drug has shown promising results in treating certain types of cancer.
   这种新药在治疗某些类型的癌症方面显示出了令人鼓舞的结果。