Two cell layers (diploblastic) separated by a gelatinous mesoglea.
两层细胞(两胚层),中间是凝胶状
中胶层。
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(视频版) 2018年4月合辑
丽新世界 
家基地 Finally nothing remains but the fibers, either gelatinous or made of horn, that constitute your household sponge, which takes on a russet hue and is used for various tasks depending on its degree of elasticity, permeability, or resistance to saturation.
刀用海绵是茶褐色,根据它的弹力、渗透力或抵抗浸渍力的程度大小,可以安排它作各种不同的用途。

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