While smell is still used as a secondary diagnostic tool in some illnesses, the lack of a reliable and objective analytical tool has prevented its wide spread usage in modern medicine.

• 虽然气味在一些疾病中仍然被用作次要的诊断手段，但是由于缺乏可靠和客观的分析工具，影响了它在现代医学中的广泛应用。