Most clinical research that involves the testing of a new drug progresses in an orderly series of steps, called phases.
大多数参与一个新药研究的临床试验是按有序的系列步骤进行的，称之为分期。
The past decade has seen "astonishing" growth in activity in MS research and there is now a substantial number of potential new therapies in the later stages of clinical testing.
过去十年已经在MS研究中取得了“惊人”增长，目前有很多潜在的新疗法处于临床后期阶段。
Allogeneic or xenogeneic neural transplantation has yielded some results, but it is still used in the research phase of animal testing, which is difficult for clinical application.
异体或异种神经移植法虽然取得了一定的效果，但仍处于动物实验的研究阶段，尚难以应用于临床。
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