It is normal for a certain number of animals to wash up dead on beaches.
"We know they were looking for a certain number of frequency converters.
Some documents must be kept for a certain number of years after an ongoing business relationship comes to an end.
They are only allowed to care for a certain number of children at a time, depending on the children's ages.
An iPad is a more limited interface, but for a certain number of things it's perfectly adequate.
Even then, the jobs must last for a certain number of years or the companies must give back the rebates.
Instead of owning the batteries, the car owners buy subscriptions for a certain number of kilometers of driving per year.
The validity of this criterion is experimentally verified for a certain number of polymers, using data taken in the literature.
They acknowledge that the Sinai area has long provided a refuge for a certain number of militants.
By creating the medical marijuana loophole, Colorado institutionalized lying for a certain number of those "con artists".
He paid for it with a grant of $20,000 that Massachusetts provides to farmers who guarantee they will stay in business for a certain number of years.
