tubing [ˈtju:biŋ]

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附加级

n.（金属、塑料等的）管形材料；装管；敷管；丘宾筒

a length of copper tubing 一截铜管
Flexible tubing can assist in installation in tight space. 柔性管道便于在紧凑的空间安装。来自辞典例句