n. an extended area of land
n. a system of body parts that together serve some particular purpose
n. a brief treatise on a subject of interest; published in the form of a booklet
n. 大片土地, 地带, 小册子
[医] 束, 道
1. The doctor examined the digestive tract of the patient.
医生检查了病人的消化道。
2. The company owns a large tract of land for development.
该公司拥有一大片土地用于开发。
3. She read a tract about environmental protection.
她读了一本关于环境保护的小册子。