backus naur form (bnf) A metalanguage used to specify or describe the syntax of a language in which each symbol, by itself, represents a set of strings of symbols.; 一种典型的元语言(以美国人巴科斯和丹麦人诺尔的名字命名),可以用来规定或描述某种 语言的语法规则,其中描述的每个符号本身代表一组符号串(的集合)。同Backus normal form。参阅metalanguage, syntax。
They should have backup details available . 他们要补充自己所知道的细节。
The system includes a backup auxiliary system . 此系统还有一个后备的辅助系统。
It's because they've got all that god stuff for a backup . 因为他们有上帝那一套玩艺儿做精神支柱。
When the main system fails, the backup system take over . 当主系统不能工作时,后备系统立即投入工作代替之。
Small rectangular backup bars were used to fabricate the web-bottom flange connection . 在腹板与下翼缘的施焊中使用小矩形挡板。
The young state secretary found simple procedures for handling the backup of trains . 这位年轻的国务秘书用简单的方法排除了车辆回流的问题。
The bravery would have counted for nothing without the technical backup of arl . 如果没有海军部研究实验室的技术支持,这一勇敢行为也就无足轻重了。
If a mistake is later detected, then we must backtrack to the point of error and try another alternative. this is called backup . 如果以后发现它是错误的,我们必须退回到点,再试另外的选择。这种方法称为回溯。
Throughout the history of gyro testing on servo runs, these timers have proven irreplaceable for backup data behind far more complex timing devices . 从整个伺服运转的陀螺试验过程来看,证明不能用后来更复杂的记时装置代替这种记时器来得到辅助数据。
This backup method is required for the 24x7 environment 24x7环境需要这种备份。