Depressed what distinction to have with spiracle?
郁闷跟气门有什么区别?
Depressed what distinction to have with spiracle?
郁闷跟气门有什么区别?
There were some spiracle connected each other among the cover, column layer and the cone layer.
表层、柱状层和锥体层之间的气孔相互连通。
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