磷虾河似乎每十年有一次或两次周期性地出现流向错误。
Periodically, once or twice a decade, the river of krill seems to go astray.
为odc的评估决定项目检查点：在项目整个生命周期中的所有阶段中，你应该计划做两次或者三次评估。
Decide project checkpoints for ODC assessment: Throughout all phases of the project lifecycle, you should plan to do an ODC assessment two or three times.
同样，包含新闻稿的页面在其整个生命周期中可能只修改一两次，所以不需要为每个请求重新生成它。
Similarly, a page representing a news story might only change a couple of times in its life, so there is no need to regenerate it on every request.
试验结果之所以令人印象深刻，是因为对许多不孕女性来说，这是自己通过体外受精怀孕的“最后的机会”——这些女性典型的状况是39岁，有过两次失败的体外受精周期。
The results were particularly impressive because many of the women were on their 'last chance' at IVF — typically aged 39 with two failed IVF cycles behind them.
针对胜坨油田有杆泵井检泵周期比较短的突出问题，进行了两次有杆泵井失效原因调查与分析。
In the light of short production cycle of rod pumping Wells in Shengtuo Oilfield, the causes of the well failure are investigated twice.
一个周期中能否有两次排卵？
在一般的供货商与销售商联合生产库存模型中均做如下假定：在一个生产周期内任意连续两次供货量之间的比值是相同的。
In the general vendor-buyer integrated production inventory models, there exists a common assumption that the ratio between two successive shipments within a production cycle is the same.
有些游泳运动员自由泳做6次打腿(一个完整的自由泳划手周期内作6次打腿)，但有些运动员则作两次或者四次。
Some swimmers kick with a six-beat kick in freestyle (six kicks for each stroke cycle), while others use a two-beat kick or a four-beat kick.
有些游泳运动员自由泳做6次打腿(一个完整的自由泳划手周期内作6次打腿)，但有些运动员则作两次或者四次。
Some swimmers kick with a six-beat kick in freestyle (six kicks for each stroke cycle), while others use a two-beat kick or a four-beat kick.
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