Thanks to our present surgical methods in physiology we can demonstrate at any time almost all phenomena of digestion without the loss of even a single drop of blood, without a single scream from the animal undergoing the experiment.
由于我们目前在生理学上的手术方法，我们可以在任何时候演示几乎所有的消化现象，甚至不损失一滴血，也不需要实验动物发出一声尖叫。
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