The central nervous systeM consisted of brain, suboesophageal ganglion and ventral nerve-cord, and the differentiations aMong protocerebruM, deutocerebruM and tritocerebruM were obvious.
其中枢
统由脑、食管下节、腹索组成，前、中、后脑
化明
。
The central nervous systeM consisted of brain, suboesophageal ganglion and ventral nerve-cord, and the differentiations aMong protocerebruM, deutocerebruM and tritocerebruM were obvious.
其中枢统由脑、食管下节、腹索组成，前、中、后脑化明。
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