The central nervous systeM consisted of brain, suboesophageal ganglion and ventral nerve-cord, and the differentiations aMong protocerebruM, deutocerebruM and tritocerebruM were obvious.
其
经系统由脑、食管下经节、腹经索组
，前、、后脑
明显。
The central nervous systeM consisted of brain, suboesophageal ganglion and ventral nerve-cord, and the differentiations aMong protocerebruM, deutocerebruM and tritocerebruM were obvious.
其经系统由脑、食管下经节、腹经索组，前、、后脑明显。
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，
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