对于down的词性好疑惑..

France's unemployment rate fell by more than expected in November,to 9.6% of its labour fource,down from a five-year high of 10.2% in May.想知道这里的这个down到底是什么词性的呢?是形容词,副词,还是介词还是什么呢?求告知,不胜感激!!

是个介词。 从高到低
The rate fell down from...to ...
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