Bbn
宽频带噪声（broad band noise）
🗣️ 情景例句
Mr. Nelson.
Nelson先生。
When will the contract be ready?
合同何时准备好？
The river which forms the eastern boundary of our farm has always played an important part in our lives.
形成我们农场东部边界的一条河流一直在我们生活中发挥着重要作用。