结果表明，单环刺消化道起源于原肠胚期内陷而成的原肠腔；
The results showed that, the digestive canal initiated from the gastrocoele, which was formed by invagination at gastrula stage.
结果表明，单环刺消化道起源于原肠胚期内陷而成的原肠腔；
The results showed that, the digestive canal initiated from the gastrocoele, which was formed by invagination at gastrula stage.
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