Given a frame to send, the buffer that holds it is released by the driver once the frame has been uploaded into the NIC's memory for transmission on the medium.
给一个发送帧，在介质上传送该帧时，一但帧已经上传到NIC的内存以后，该帧的缓存会被驱动释放。
Given a frame to send, the buffer that holds it is released by the driver once the frame has been uploaded into the NIC's memory for transmission on the medium.
给一个发送帧，在介质上传送该帧时，一但帧已经上传到NIC的内存以后，该帧的缓存会被驱动释放。
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