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英语翻译Protoplasm has approximately the same density as water,s

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英语翻译
Protoplasm has approximately the same density as water,so a fish in water is almost weightless.This "weightlessness" in turn means two things:One,a fish can get along with a light weight and simple bone structure,and two,limitations to a fish's size are practically removed.
原生质的密度与水相近.因此鱼在水中几乎是无重力的.这种“无重力状态”意味着:1,鱼可以很好适应较轻的体重和简单的骨骼结构;2,鱼的体型可以无限大.
没有完全按字面意思翻译.但是是符合逻辑的译法.