1. A system of tubes. 
   管道系统
2. There were test tubes. 
   这儿有一些试管。
3. thistle of western North America having white woolly leaves. 
   北美洲西部的蓟，有白色绒毛的叶子。
4. Bronchial, Fallopian, Eustachian tubes 
   支气管、输卵管、耳咽管
5. The tubes were examined macroscopically. 
   这些管子都非常细致地检查了。

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