n. 1.广阔的地面；(一大段)土地[森林]，地带；地域；广阔海面[天空]。 2.〔古语〕一段时间，长时间。 3.【解剖学】管，道，系统；(神经纤维的)束。 短语和例子 a wooded tract 一大片森林。 digestive tract 消化道。 the optic tract 视(神经)束。 the motor tract 运动神经索。 n. (政治、宗教的)短论；小册子；传单；【天主教】续唱。
a bundle of myelinated nerve fibers following a path through the brain 同义词：nerve pathway, nerve tract, pathway,
a system of body parts that together serve some particular purpose
a brief treatise on a subject of interest; published in the form of a booklet 同义词：pamphlet,
an extended area of land 同义词：piece of land, piece of ground, parcel of land, parcel,
例句与用法
1.
Large tracts of wasteland have become a granary ... 荒滩变成米粮川。
2.
They opened up large tracts of wasteland . 他们开垦了大片荒地。
3.
In the past nothing could grow on this tract of land . 过去这块地不立苗。
4.
Fine bubbles originate in the lower respiratory tract . 小汽泡则来自下呼吸道。
5.
He wrote a tract on this subject . 他曾对此写了一篇短文。
6.
What he saw was a tract of sand . 他看到的就是一片沙地。
7.
The respiratory tract conveys oxygen-rich air to the lungs . 呼吸道给肺输送富氧的空气。
8.
Drainage is usually carried out after biliary tract surgery . 通常在胆道手术后进行引流。
9.
The bay shore of the silverthorn tract was very irregular . 银刺地带那儿的海岸线曲折蜿蜒。
10.
Respiratory tract fluid is the major product of the normal lung . 呼吸道液体是正常肺的主要产物。
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