求翻译：鲸是哺乳动物。鲸的体温是恒定的，平均为35．5℃.鲸的体形差异很大，小型的体长都有6米左右，最大则可达30米以上；最重的可达170吨以上，最轻的也有2000公斤。是什么意思？

Whales are mammals. Whale's body temperature is constant, averaging 35. 5 ℃. Whale's body shape varies greatly, the small body length of about 6 meters, up to 30 meters above the maximum is; the heaviest up to 170 tons, with 2000 kg of the lightest.

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The whale is the mammal.Whale's body temperature is constant, the average is very big for 35.5℃. whale's build difference, the small body long all has about 6 meters, most greatly may amount to above 30 meters; Heaviest may amount to above 170 tons, lightest also has 2000 kilograms.

Whales are mammals. Whale's body temperature is constant, averaging 35. 5 ℃. Whale's body shape varies greatly, the small body length of about 6 meters, up to 30 meters above the maximum is; the heaviest up to 170 tons, with 2000 kg of the lightest.

Whales are mammals. Whale's body temperature is constant, averaging 35. 5 ℃. Whale's body shape varies greatly, the small body length of about 6 meters, up to 30 meters above the maximum is; the heaviest up to 170 tons, with 2000 kg of the lightest.