尽管上下求索数千年，但人们对梦的科学认识仍然进展甚微。
In spite of thousands of years of endeavour, little progress has been made in the scientific understanding of dreams.
直到最近，科学家们还认为其他星球上的生命只是一个充满希望的梦。
Until recently, scientists believed that life on other planet was just a hopeful dream.
尽管我们回想不起夜间梦景，科学家日益相信，我们的梦在记忆和学习中起重要作用。
While we may not recall our nocturnal visions, scientists increasingly believe our dreams play an important role in memory and learning.
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