low-grade fever

例句：

1. 1. He felt a low-grade fever and decided to rest.
   他感到了低烧，决定休息。
2. 2. Thepatient had a low-grade fever forseveral days before the doctor could diagnose thecause.
   在医生能够诊断出原因之前，病人已经发烧好几天了。
3. 3. Low-grade fever is often a sign of anunderlying medical condition.
   低烧往往是某种潜在医疗状况的标志。