Setting the value to once is useful if a constraint is static once initialized, as it will then only be evaluated once and increase efficiency.
如果一个约束在初始化之后一直是静态的，那么可以将这个值设为once，这样可以使约束只计算一次，可以提高效率。
In 1925 only 1, 100 Kings were counted at St. Andrews Bay; since then there has been a 300-fold increase in the rookery.
据1925年在圣安德鲁斯海湾的统计，这里只有1100只王企鹅；此后这块繁殖地中王企鹅的数量增加了300倍。
And if we consume it at the present rate, 3% or increase maybe by only three percent per year, then we won't have any left in less than 100 years.
如果我们继续以现在的速度消耗下去，或者也许每年只增长,则我们在不到100年的时间里,将变得一无所有。
The only way speculation can have a persistent effect on oil prices, then, is if it leads to physical hoarding - an increase in private inventories of black gunk.
投机行为能够对油价具有持续效应的唯一方法就是(如果它会导致实际的囤积行为的话)，增加这种黑色粘滑液体的私人库存。
Then, it can not only enhance the efficiency of the practice operation, but also increase certain accuracy.
如此一来，既提高了实践操作的效率，也增加了一定的准确度。
The placebo group showed a slight increase of activity up to the 5th day. Only then radioactivity began to decline.
而安慰剂组直至试验的第五天放射活性仍有轻微的增加，从那以后放射活性才开始下降。
The placebo group showed a slight increase of activity up to the 5th day. Only then radioactivity began to decline.
而安慰剂组直至试验的第五天放射活性仍有轻微的增加，从那以后放射活性才开始下降。
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