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煤焦油有很强烈的气味，并且会染污衣服。
Coal tar has a strong smell and can stain clothing.
youdao
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机身部分喷涂黑色，以防发动机排气染污。
And some parts are painted black to avoid the dust from the engine jets.
youdao
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让白色染污永远消失！
Let the white pollution disappear forever!
youdao
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让白色染污永远消失！
Let the white pollution disappear forever!
youdao