... quieted aircraft ==> 有消音设备的飞机 quieter material ==> 消音材料 quieter motor ==> 无噪声马达 ...
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quieter material
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
The group wants the Highways Agency, which is responsible for the section, to replace the concrete with a "quieter and more suitable" material.
BBC: A419 campaigners want 'noisy' road surface to be replaced
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