useful length of track 股道有效长
useful length of screw thread 有效螺纹长度
Useful rolls length 有效长度
useful chamber length 闸室有效长度
Even though RUP is more flexible in the definition of an iteration, the 30-day window is often used in RUP and determined to be a useful size in length.
尽管在对“迭代”的定义上RUP更为灵活，30天的限定仍然经常被RUP使用，并且已被认为是一个有效的长度。
If complete removal of the character data is too extreme and you want to preserve at least the length of each node, a variation on Listing 1 might be useful.
如果彻底删除字符数据过于极端，希望至少保留每个节点的长度，可以使用清单1的一个变体。
It may be useful to ascertain in the annotator code that a specific length may not be exceeded in the created annotations.
在注释器代码中确保创建注释时不超过特定长度是非常有用的。
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