It is hard to track the blue whale, the ocean's largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species.
作为海洋中最大的生物，蓝鲸很难追踪，但由于商业捕鲸，它们几乎灭绝，现在已被列为濒危物种。
The largest creature ever to live, the blue whale averages 25 feet (7.6 meters) long at birth and weighs about three tons.
蓝鲸是最大的尚存生物，它们在出生时平均长达25尺(7.6米)重达大约3吨。
The largest creature the scientists found was a thalattosaur, a marine reptile about 10 long, which would have preyed on the larger fishes there.
科学家们发现的最大型的动物便是海龙化石，这是一种海洋爬行动物，大概有十米长，他以捕食较大的鱼类为食。
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