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生产工艺先进，对环境无污染。
Advanced production process with no pollution for the environment.
youdao
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密封性好，对作业环境无污染，操作方便，噪音低。
Good seal, no pollution of the environment, easy operation and low noise.
youdao
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密封性好，对作业环境无污染，操作方便，噪音低。
Good seal, no pollution of the environment, easy operation and low noise.
youdao