现在，奥运会已经结束了，建设规模已经大幅度下降，所以空气中的粉尘下降了不少。
Now that the Olympics are over there's been a massive drop in construction, and so dust particles have been reduced.
youdao
杰夫。：悉尼奥运会已经圆满结束了。
Jeff: The Sydney Olympics was concluded satisfactorily.
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