不变价 meaning in English

at constant price in real terms
constant terms
fixed price

The paper think that gdp accounted by current price is the value quantity index and gdp accounted by past price is neither the value quantity index nor the use value quantity index
现价gdp是价值量指标，用不变价核算的gdp既不是价值量指标，也不是使用价值量指标，但使用相同不变价的gdp的比值可以表示使用价值量的增长速度。
The growing external deficit appears to be structural : since 1990 , us exports of goods and services have been growing at 5 . 7 per cent a year , in constant prices , while imports have been growing at 8 . 8 per cent
对外赤字增长似乎是结构性的：自从1990年以来，用不变价来衡量，美国产品和劳务出口每年增长5 . 7 ，而进口增长8 . 8 。