每日背誦第二期76

所屬教程:每日背誦第二期

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Possessing neither blood nor brain, jellyfish are primarily filled with a jelly-like substance loaded with nerve cells that help them navigate the seas. These cells detect light and touch, and then pass this information on to muscle cells. In all its simplicity, the jellyfish has existed for more than 600 million years with little change. Perhaps the jellyfish is indeed nature's perfect beast.

水母既沒有血液也沒有大腦，主要由滿是膠狀物質(zhì)的神經(jīng)細胞來協(xié)助它在海中的航行。這些細胞能偵測光線和觸覺，然后把信息傳達到肌肉細胞。雖然水母的結(jié)構(gòu)很簡單，它已經(jīng)在地球上存在超過六億年了，而且沒有什么改變。也許水母真的是自然界中真正的霸主。

(短文節(jié)選,本篇始于：海中“刺”客──水母)

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