start frame delimiter 起始帧分界符 ; 字节的起始帧分界符 ; 分界符 ; 帧首定界符
start of frame delimiter 帧首定界符 ; 帧起始定界符 ; 起始定界符 ; 前导码和帧起始分隔符
ending-frame delimiter 末框定界符
starting-frame delimiter 起始框架定界符
star-of-frame delimiter 帧起始分隔符
SFD start frame delimiter 起始讯框符号
nstart of frame delimiter 帧首定界符
start t of frame delimiter 帧起始定界符
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