The central nervous systeM consisted of brain, suboesophageal ganglion and ventral nerve-cord, and the differentiations aMong protocerebruM, deutocerebruM and tritocerebruM were obvious.
其中枢神
系统由脑、食管下神
、
神索组成，前、中、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.
其中枢神系统由脑、食管下神、神索组成，前、中、后脑明显。
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