回复：西子，说说看！

来源: 于 2012-02-27 14:51:02 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次
You can hear it even with windows closed. Low frequency noise pass a long way if there is no trees or buildings in between.

Especially at night.

Stay away from high way.