相反，对于那些认为成绩下降是一种永久的、无法挽回的状态的学生来说，成绩的下降只会预兆着他们应激激素的上升。
Instead, declining grades only predicted worse stress hormones among students who believed that worsening grades were a permanent and hopeless state of affairs.
头痛得重视，因为它可能是一种严重疾病的第一个预兆，如果及早发现的话，这种严重疾病可能会得到控制。
A headache is important because it can be the first warning of a serious condition that could probably be controlled if discovered early.
金价的下降也可能是另外一种方式的预兆。
黑压压的云有一种不祥的预兆，但透过上部的光线是一种最终救赎的象征。
The clouds are dark and foreboding, but the light breaking through above is symbolic of his eventual redemption.
金价的下降也可能是另外一种方式的预兆。在经济重振期，几乎所有的资产都相继升值。2010年可能会有更多的分化。
Gold's fall could be an omen in another way, too. During the rally, almost all assets rose in tandem. During 2010 there may be a lot more differentiation.
那被认为是一种不幸的预兆。
然而，不可能确定自噬空泡的增加是否是一种适应性反应或细胞死亡的预兆。
However, it is not possible to determine whether the increase in autophagic vacuolization is an adaptive response or a harbinger of cell death.
古代的人们相信月蚀是一种坏的预兆。
例如，在美国，猫头鹰经常被看为一个智慧的象征，但是在尼日利亚的一个地区，它被看作是一种邪恶的预兆。
For example, in the United States, the owl is often used as a symbol of wisdom, but in one region of Nigeria, it is an omen of evil.
例如，在美国，猫头鹰经常被看为一个智慧的象征，但是在尼日利亚的一个地区，它被看作是一种邪恶的预兆。
For example, in the United States, the owl is often used as a symbol of wisdom, but in one region of Nigeria, it is an omen of evil.
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