For instance, now and then scientists are hampered by believing one of the over-simplified models of science that have been proposed by philosophers from Francis Bacon to Thomas Kuhn and Karl Popper.
比如，科学家会不时因相信从培根到库恩、玻普这些哲学家所提出的过分简化的科学模型而受到桎梏。
Then scientists can search for ways to alter them.
接下来科学家们可以研究出方法去改变它们。
Since then, scientists have found clues to explain these animal transitions in the fossil and molecular records, as well as in energetic analyses, but the full story is yet to be discovered.
自那时起，科学家陆续找到了化石和分子水平的证据，以及通过能量分析来解释这一进化过程，但是尚未达到完全理解的程度。
But since then, scientists have been stumped about how they got there.
但是自从那时以来，科学家们一直无法解释它的成因。
Then scientists at Bell Labs produced a version that ran on hydrogen peroxide and provided a few seconds of lift.
随后贝尔实验室的科学家们制造出的一个版本采用过氧化氢，并能提供数秒的空中时间。
Galileo first spotted Saturn's rings 400 years ago. But since then, scientists have been stumped about how they got there.
自四百年前土星环被伽利略首次发现以来，科学家一直难以对其成因做出解释。
Galileo first spotted Saturn's rings 400 years ago. But since then, scientists have been stumped about how they got there.
自四百年前土星环被伽利略首次发现以来，科学家一直难以对其成因做出解释。
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