| environ. | traffic noise control Traffic noise can be controlled by reduction at source, by fitting motor vehicles with silencers, by installing barriers which interrupt the direct path of sound or by insulating dwellings exposed to high noise levels, such as those related to motorways or airports | 交通噪声控制 (交通噪声可通过减少噪声源来控制，通过给机动车安装消音器、通过建立障碍物来阻断声音的直接路径，或使处于高噪声水平的区域与外绝缘，例如与高速公路和机场相关的区域。) |