英语语法分析

When he got back, he switched labs to study how cerebrospinal fluid nourishes the developing nervous system.

回来后，他将实验室里的研究课题转向了脑脊液如何滋养发发育中的神经系统。

Two cerebrospinal fluid specimens have tested positive for Neisseria meningitidis serogroup by latex test.

通过乳胶测试，两个脑脊液标本对脑膜炎奈瑟菌血清群呈阳性反应。

Two cerebrospinal fluid specimens have tested positive for Neisseria meningitidis serogroup A by latex test.

经乳胶试验，两份脑脊液标本检测呈脑膜炎奈瑟菌血清组阳性。