恐惧因素根据科斯·菲尔德的说法，你不必担心二手车经销商向你喷涂氧毒素，因为几乎不可能将一剂的氧毒素制成雾状。
FEAR FACTOR you don't have to worry about a used-car dealer spraying you with oxytocin-according to Kosfeld, it's almost impossible to aerosolize a dose.
研究者们主张，不论是什么因素导致了氧同位素在古代的波动，这些波动确实证明了当时气候也曾逐年变化，就如同现在一样。
Whatever caused the ancient fluctuations in isotope ratios, the researchers contend, those variations are a sign that climate back then varied from year to year just as it does today.
体型更大的生物生存的关键因素是氧气，氧含量的变化史也刻在了埃迪·卡拉岩石群上。
A key requirement for larger creatures is oxygen, and the dramatic history of oxygen levels is also etched in Ediacaran rocks.
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