By 2300 B.C.E. the number of signs required had been reduced to 600, and the range of words that could be expressed had widened.
到公元前2300年,所需的符号数量已减少到600个,词汇可表达的范围也扩大了。
By 2009 it had widened to 34 points.
到09年这一差距扩大到了34点。
By 2009, however, the gap had widened again, to 6.4% of GDP.
到2009年,差距再度扩大,达到了GDP的6.4%。
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