表面下的生命(Life beneath the surface)

海牛不是为了生活而奔跑，它们只是漂浮着。这些温和的海洋巨人在温暖的水域航行了数百万年，致力于放牧和休息。然而，尽管它们平静地存在，但今天它们面临着严重的威胁。
原文：
Manatees don't run for a living, they just float. These gentle ocean giants have sailed in warm waters for millions of years, dedicated to grazing and resting. However, despite their peaceful existence, they face serious threats today.
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