当这种酶的活性降低时，血压随时间下降。
When the activities of the enzyme decline, the blood pressure goes down with time.
结果：脊髓半切后，神经元数目随时间下降。
RESULTS: After spinal cord hemisection, the number of neurons in the spinal cord decreased with time.
传统的过滤净化技术虽然能有效地清除微米级大小的夹杂物，但存在过滤效率随时间下降的问题。
Tradition separation methods have low removal efficiency to the time and can't remove the small dimension inclusions.
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