Heavy duties are imposed on imports.
对
口物
课以
。
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么说
物传记 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.

混凝
保留了它大部分的硬度,依然可被使用于重型项目,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。