Not only can scientists now identify what types of planets exist, they can see how common each type is, yielding clues into the enigmas of planetary formation.

现在科学家不仅能识别行星的存在形式，还能够了解每种类型的数量，找出行星构造之谜的线索。

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This first step can be difficult. Here are some common questions, which give clues to both the objections and the resistance that women may have.

第一步骤也许很困难，有些女人反对这么做，以下常见的问题可提供这类女性一些线索。

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This article summarizes the common ways of guessing the word meanings according to transliteration, general knowledge, word-building and context clues, etc.

文中概述了阅读理解中常用的猜测生词词义的方法，包括根据词音猜词、普通常识猜词、利用构词法猜词和利用上下文关系猜词。

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Nietzel says the most common place the clues about "where warm waters halt" first lead people is to Eagle Nest Lake, about 100 miles north of Santa Fe, because it has a dam that holds back warm water and is known for its brown trout.

NPR: 'I Love Mysteries,' Says Man Claiming Hidden Gold

For the more common "dry" form a series of genetic discoveries have offered the first good clues to its causes, providing leads for new drugs and genetic diagnostic tests.

FORBES: Banishing Blind Spots

With no environmental clues as to their common ancestry, the birds were nevertheless able to engage in full-fledged nepotism.

ECONOMIST: Team players