... clean down刷干净 clean down the dirt扫下脏东西 clean off清除 ...
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clean down the dirt 从墙上扫下脏物 Let us clean down the board before we paint it . 让我们在上漆以前把这块板洗干净。
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clean down the dirt
清理污垢
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They built a thin layer, or "nanostructure, " using minute particles of titanium dioxide, a substance that reacts with sunlight to break down dirt and other organic material and can be coated on cotton to keep the fabric clean.
CNN: Washing no longer dirty work
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