1. 邮箱：现在RVD可以支持大部分操作系统的OS Awareness,通过OS Awareness可对系统的资源进行观察,例如进程(Thread)、信号量(Semaphores)、邮箱(Mailboxes)、队列(Queues)等,如图3.
1. It has set up mailboxes on buses on the routes to some remote communities, where mail delivery is inconvenient for postal workers.
2. Byrd said deputies saw the truck weaving, and at one point it mowed down some mailboxes.
3. Large hotels have mailboxes and sell stamps for letters, post cards and parcels.