Speculators, by contrast, buy and sell securities based on whether they believe those securities will next rise or fall in price.
投机者，相比之下，购买和出售证券取决于他们是否认为这些证券的价格将上升或下降。
Alvin Hansen and Paul Samuelson constructed equations to predict how a rise or fall in spending in one part of the economy would propagate across the whole of it.
阿尔文·汉森和保罗·萨缪尔森构建了一些描述经济体某一部分支出的涨跌如何扩展至整个经济体的等式。
A rapid rise or fall in temperature may cause a febrile seizure in a small percentage of children younger than age 5.
在小于5岁的小孩中，很小一部分会因为体温迅速波动而引发痉挛。
They are asked to report any sharp rise or fall in the water table or if water bubbles in the well, becomes murky or changes in taste.
水位突然的上升或下降、水井冒泡、变浑或变味，他们都要报告。
They are asked to report any sharp rise or fall in the water table or if water bubbles in the well, becomes murky or changes in taste.
水位突然的上升或下降、水井冒泡、变浑或变味，他们都要报告。
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