实施的研究中的参与者，反正都是要做手术的，因此同意了参加实验。
reported in the prestigious journal Science, were undergoing brain surgery anyway and so agreed to an experiment.
捐献者脑死亡后，在实施器官摘除手术前，还需要置于血液循环状态，以确保要捐献的器官血流畅通。
In brain death donations, the donor is kept on a ventilator to keep blood flowing to organs until they can be removed.
接下来，研究者在鸟的升上实施了一些小手术，使得前述中的两个系统的一种不能正常活动。
Next, the researchers performed surgeries on the birds to deactivate one of the two systems.
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