communications overhead的用法和样例：
例句
- Loading data over the network adds extra communication overhead.
通过网络装载数据将增加额外的通信开销。 - Compared with the existing schemes, the proposed scheme can rekey real-time, provide a high level of security and reduce communication overhead at the same time.
与已有方案相比较，此方案能实时地更新组密钥，有着更好的安全性并具有较小的通信开销。
