Heavy duties are imposed on imports.
对
物
课

。
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The translucent concrete maintains most of its strength, so it can still be used for heavy duty projects, like constructing buildings or roadways, or it can be used in otherwise difficult-to-light areas, like subway tunnels and walkways.
这种混凝
保留了它大部分的
,
然可被使用于重
项目,例如建造楼房或公路,或者它还能被用于难见光区域,比如地铁隧道和通道。
Some people took a larger category from BLS of sales and delivery workers that was about three and a half million, workers and others took the heavy duty truck driver category, which was at the time about 1.8 million or so.
有些人选取了BLS中销售和配送工人这一较大的类别, 大约有350万工人,而另一些人则选取了重
卡车司机这一类别,当时大约有180万人左右。