A tube like object approaches Alice from the back. Of course, Alice doesn't notice.
The tube is pierced in an arrangement so that it is not possible to remove. (1)
The Alice with the tube sticking out is transferred, and then dumped into the donut-shaped structure. (2)
(1) I'm not too sure about this translation. I think it was talking about how the tube is inserted so that Alice can't remove it, but not too sure.
(2) The first 3 kanjis after the comma has me stumped. I thought it meant "artificial structure" since zousaku meant "structure", but again not sure. Can someone more fluent in Japanese double check this?