The U type Concrete Block is laid in the channel to prevent seepage of water.

型砌块是用来防止渠道渗漏而铺设在渠道中的砼砌块。

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The U type Concrete Block is laid in the channel to prevent seepage of water.

型砌块是用来防止渠道渗漏而铺设在渠道中的砼砌块。

youdao