Scientists working off the Yucatan Peninsula are preparing to use sound waves to search for information about an asteroid that may have wiped out the dinosaurs 65 million years ago.

多国科学家组成的科研小组将对墨西哥尤卡坦半岛著名的“奇科苏卢布”陨石坑进行声波探测，而这个巨大的陨石坑可能就是6500万年前造成恐龙灭绝的根本原因。 科学家们希望通过这一研究能找到当时彗星或小行星撞击地球的更多的有用信息。

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The researchers hypothesize that electromagnetic waves (EMW) emitted by cell phones may have a dual action on male hormone levels and fertility.

研究人员推断手机发出的电磁波(EMW)可能对男性激素水平及生育能力有着双重作用。

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Ship may have to wait for days before finding a time when incoming waves and tidal currents are right, permitting them to enter the harbor with safety.

船只必须等待多日才能等到合适的波和潮流，从而使得它们能安全地进港。

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Geddes said it was low tide when the waves struck -- which may have helped prevent even worse damage.

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The continuing waves of negative economic reports in May, June, July and now into August have had economists scrambling to revise their growth forecasts downward, but they have not been quick enough to keep up with the pace of the downbeat reports.

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Of course, for those of you with a low enough risk tolerance or who have taken on a high enough level of risk the waves of panic may be more or less constant.

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