Even if the prey had a good sensory system to notice a predator closing in, the success rate of a nocturnal attack may be higher than a diurnal attack.

即使猎物拥有很好的感知系统，注意到了食肉动物正在靠近，夜间攻击的成功率也可能比白天攻击的成功率高。

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Second, even if its exchange rate is not overvalued, a country could face a successful attack by forex speculators if it does not have a very large amount of foreign exchange.

第二，即使一国货币的汇率没有被高估，如果它没有大量外汇储备，也有可能受到外汇投机者的成功袭击。

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The secondary attack rate of seasonal influenza ranges from 5% to 15%. Current estimates of the secondary attack rate of H1N1 range from 22% to 33%.

季节性流感的续发率从5%至15%不等，而据目前估计，甲型h1n 1流感续发率在22%至33%之间。

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The New England Journal study, involving 1, 400 adults over a 2.5 year period showed that the rate of heart attack 1 month after a negative coronary CT was less than 1 percent, showing that it is a safe test for patient discharge from the ER.

FORBES: Coronary CT Scans May Save You (And Your Hospital)

After years of controversy, the Food and Drug Administration has asked Abbott Laboratories to yank the weight loss drug Meridia, generically known as sibutramine, from the market as a result of a large clinical trial that found the drug increased the rate of heart attack and stroke in patients at high cardiovascular risk.

FORBES: FDA Yanks Meridia -- And Finds It In A Supplement

Changing one's heart rate gradually appears to lower the risk of an attack, Dr. Craig says.

WSJ: Kids With Asthma Play Hard, Too