As recently as 1965, the Aral Sea received about 50 cubic kilometers of fresh water per year-a number that fell to zero by the early 1980s.
在1965年，每年大约有50立方公里淡水流入咸海，到20世纪80年代却几乎为零。
Short-term U.S. interest rates wouldn’t change: they’re being kept near zero by the Fed, which won’t raise rates until the unemployment rate comes down.
其实美国的短期利率是不会有变化的：因为它们一直被美联储控制在接近于零的位置，而且美联储也不会在失业率出现下降之前提高利率。
Stephen Green, an economist at Standard Chartered, expects China's real export growth to fall to zero by the end of this year and to turn negative next year.
渣打银行的经济学家斯蒂芬·格林预计，至今年年末，中国净出口增值将降至零点，明年将呈负值。
For all disturbances which the upper bounds are unknown, the tracking errors decrease uniformly asymptotically to zero by the designing of switching strategy.
通过设计切换律，对于具有未知上界的干扰，保证跟踪误差一致渐近趋于零。
For all disturbances which the upper bounds are unknown, the tracking errors decrease uniformly asymptotically to zero by the designing of switching strategy.
通过设计切换律，对于具有未知上界的干扰，保证跟踪误差一致渐近趋于零。
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