Plotted on a graph, the history of clean-energy production in the United States resembles the blade of a saw, rising and falling each time subsidies came and went.

从图上看，美国清洁能源的生产的历史就像是锯齿，随着补贴的来去而起落。

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Rising and falling edges on VIN take more time to travel through inverters 501-504 than through inverters 505-506.

VIN的上升和下降沿通过反相器501 - 504的时间要比通过反相器505 - 506的时间要多。

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Already threatened by rising temperatures and pollution in cities that have combined to reduce the number of flowers, the iconic cherry blossoms are also falling victim to time.

不断上升的气温和日益严重的污染已经使樱花数量减少，而作为日本的标志，樱花也熬不过时间。

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While the number was slightly below consensus expectations of 205, 000, the combination of falling job cuts and rising private employment is encouraging in a time of falling home prices and continued global shocks, from Libya to Japan.

FORBES: Ahead Of Friday's Employment Report: Q1 Job Cuts Fall To Lowest Since '95

But Bolden concedes that she has had a hard time figuring out just how many teachers to hire because the number of students at Fischer keeps rising and falling as parents try to find the best school closest to home.

NPR: Remaking the New Orleans School System