消声器
Mufflers and horns of motor vehicles driven within urban areas must meet the requirements of the State. 在城市市区范围内行驶的机动车辆的消声器和喇叭必须符合国家规定的要求。
Exhaust pipes, mufflers, and tailpipes can also be responsible for various thumps, clangs, and rattles. 排气管，消声器，和排气尾管同样会发出各种隆隆声，铿锵声，和卡嗒声。
