近几年，脑成像技术，比如功能核磁共振成像(fMRI)使科学家能够在人活动的过程中观察大脑并且确定神经细胞如何发挥作用。
In recent years, brain-imaging techniques, such as functional magnetic resonance imaging (fMRI) have allowed scientists to observe the brain in action and determine how groups of neurons function.
星细胞构成了几乎半个大脑，此前被认为是大脑的“胶水”而并非在脑活动中起作用。
Astrocytes, which comprise about half the brain, had not been thought to play an active role in brain processes, and were thought to serve as the "glue" of the brain.
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