英语词典
A three-way piece which causes the main ear piece, the auxiliary ear piece and the chest piece to communicate is connected in the bottom rubber pipe of the stethoscope for teaching.
该示教听诊器在下胶管中都接有一个将主、副耳件及胸件接通的三通接头。
互联网摘选
The perforator is a three-way connecting piece, two openings of the perforator are upwards parallel, and one opening is downward and is made into an oblique opening.
其特征在于打孔器为三通联接件，其两口平行向上，一口向下并做成斜口；
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