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biology 生物 a system of connected organs or tissues along which materials or messages pass （连通身体组织或器官的）道，束 the digestive tract 消化道 a nerve tract 神经束
an area of land, especially a large one 大片土地；地带 vast tracts of forest 大片大片的森林 They bought a 40-acre tract of land for development. 他们买了一块40英亩的土地用于开发。
Extra ExamplesThe county has small towns and villages and large tracts of moorland. 该县有小城镇和村庄以及大片高沼地。 Whole tracts of the countryside have been turned into industrial wasteland. 成片成片的乡间土地都变成了工业废地。
- (sometimes disapproving)
a short piece of writing, especially on a religious, moral or political subject, that is intended to influence people’s ideas （尤指宣扬宗教、伦理或政治的）短文，传单，小册子 feminist tracts 女权主义传单
Word Originsenses 1 to 2 late Middle English (in the sense ‘duration or course of time’): from Latin tractus ‘drawing, draught’, from trahere ‘draw, pull’.sense 3 late Middle English (denoting a written work treating a particular topic), apparently an abbreviation of Latin tractatus, from tractare ‘to handle’, frequentative of trahere ‘draw’. The current sense dates from the early 19th cent.