2N-COUNT (宗教、道德或政治的)短文 A tract is a short article expressing a strong opinion on a religious, moral, or political subject in order to try to influence people's attitudes. (宗教、道德或政治的)短文
She produced a feminist tract, 'Comments on Birth-Control', in 1930.
3N-COUNT 道;束 A tract is a system of organs and tubes in an animal's or person's body that has a particular function, especially the function of processing a substance in the body. 道;束 [medicine]
Foods are broken down in the digestive tract.
食物在消化道里分解。
A cold is an infection of the upper respiratory tract.