- ascending tract[医] 上行束;
- alimentary tractn.消化道，营养管;
- biliary tract胆道;
- corticospinal tract皮质脊髓束;
- corticobulbar tract皮质延髓束;
- digestive tract消化管;消化道;
- descending tract[医] 下行束;
- fiber optic光纤;
- genitourinary tract生殖泌尿道，泌尿生殖道;
- gastrointestinal tract胃肠道;
- optic radiation视辐（射）线;
- optic nerven.视神经;
- optic glioma视神经胶质瘤;
- optic chiasm[医]视交叉，视神经交叉;
- respiratory tract infection[医]呼吸道感染;
- respiratory tract呼吸道;
- urinary tract infection尿路感染;
- urinary tract泌尿道，尿路;
- vocal tract声道;
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