It's called the synaptic cleft and it's filled with extracellular fluid.
这一空间叫做突触间隙,中间充满了细胞外液
耶鲁公开课 - 生物医学工程探索课程节选
Antibodies are outside of cells circulating in your extracellular fluid.
抗体在细胞外的 细胞外液中循环
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