重要的汇率价停留在1美元对7.8141人民币，这是全年最低的汇兑比率。
The central parity price closed at one U. S. dollar for 7.8141 yuan, the lowest of the year.
为什么是1999年呢？因为1990年代的比率基本是稳定的，而也正是在这一年房价出现了突然的上升。
Why 1999? Because the ratio was relatively stable throughout the 1990s, and it was the year the steep rise in prices began in earnest...
六价铬对总铬比率低于3%，是最次要的形态；三价铬对总溶解铬的比率在80%以上，所以三价铬在溶解态中占主要形态。
Trivalent chromium in dissolved state occupies a principal position, so that ratio of trivalent chromium to total dissolved chromium is more than 80%.
六价铬对总铬比率低于3%，是最次要的形态；三价铬对总溶解铬的比率在80%以上，所以三价铬在溶解态中占主要形态。
Trivalent chromium in dissolved state occupies a principal position, so that ratio of trivalent chromium to total dissolved chromium is more than 80%.
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