管的一头轻轻伸入直肠。
鹅颈管只伸入钢瓶内部较短的距离，弯曲到阀门排气口对面的钢瓶内侧。
The gooseneck goes only a short distance into the cylinder and then bends to the cylinder side opposite the valve outlet.
阀门上连接着“汲取管”，汲取管伸入到钢瓶内侧。
The valves are connected to "DIP TUBES" that run to the cylinder sides.
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