透明的，圆柱形玻璃管，通常一端开口另一端为圆形，用于实验室实验。
A clear, cylindrical glass tube usually open at one end and rounded at the other, used in laboratory experimentation.
插条不能明显偏斜，开口缝应在中间，不管插条还是管端咬口翻边应准确、压紧，以后连接接头才会整齐、贴紧。
The not significant deviation, open seams should be in the middle, or whether cutting pipe end bite flange should be accurate, pressing, after the joint will be neat, close.
第一和第二套管针活门定位在套管主体端盖内，并且各自在其中间部分具有开口。
First and second trocar valves are positioned within the cannula body end housing and each having an opening in a medial portion thereof.
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