Two cell layers (diploblastic) separated by a gelatinous mesoglea.
两
细胞(两胚
),中间是凝胶状
中胶
。
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》系列纪录片
册 Below, on a plain still covered with a thin layer of morning mist, a herd of gazelles leapt and played, the young ones jumping over brush with abandon and then spooking as an even larger herd of zebras passed by.
山脚下的平原还笼罩着
层薄薄的晨雾,
群瞪羚在那里跳跃嬉戏。年幼的瞪羚恣意地在灌木丛里跳来跳去,但不久便发出了惊恐的叫声,
为
群比它们高大的斑马刚好路过此地。