下降线是指在一次函数y=kx+b中，k<0,构成的直线从左往右呈下降趋势（左高右低）
最速下降线 line of steepest descent
最快速下降线 [数] line of quickest descent
最迅速下降线 [数] line of swiftest descent
最陡下降线 [数] steepest descent line
直线下降 plummet ; linear decrease ; en picado ; Take a nose dive
下降曲线 recession curve ; decline curve ; depression curve ; declining curve
地下水降落曲线 drawdown curve
液面下降曲线 drawdown curve
直线下降的 Plummeting
下降趋势线 Declining Trend lines ; Descending Trend Line ; Down Trend line
通货膨胀率下降是长期经济衰退中的一线希望。
The fall in inflation is the silver lining of the prolonged recession.
最近一项研究发现，过去两年中，装有家用高速网络的美国人数量实际上有所下降，有15%的人认为自己是“掐线者”。
A recent study found that the number of Americans with high-speed Internet at home today actually fell during the last two years, and 15% of people now consider themselves to be "cord-cutters".
当下降的水位低于内表面刻下的小时线，表示经过了多少时间。
The falling water level denoted the passing hour as it dipped below hour lines inscribed on the inner surface.
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