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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Plans were originally introduced following the 2009 milk crisis that saw a combination of rising production costs and falling prices.

BBC: EU dairy package

First, the 1980s and 1990s saw generally falling interest rates and rising share prices the ideal background for private equity to succeed.

ECONOMIST: The real risks of private equity