After becoming a net petroleum importer country in 1993, the degree of dependence upon import has been increasing year by year.
自从1993年我国成为石油净进口国以来，我国石油对外依存度逐年上升。
The year of 1993 saw China turned from an oil export country into a net import one.
1993年，中国从石油出口国变为了石油净进口国。
Since 1999 when China became a net grain import country, our grain production had experienced the output of less than 500 million tons for 8 consecutive years.
自从1999年我国开始成为净粮食进口国以来，我国的粮食产量已经是连续8年低于5亿吨。
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