Charles Wortmann at the University of Nebraska-Lincoln says a one-time tillage may be used to correct a problem like aggressive weeds.

VOA: special.2010.09.28

But no - those surprised Russians thought that no one regiment by itself would come around there at such a time.

VOA: special.2011.03.26

The study found there is strong support for restricting work by doctors-in-training to sixteen or fewer hours at one time.

VOA: special.2010.07.13

Guides tell visitors that Lincoln lived at the house for one-fourth of his time as president.

VOA: special.2010.05.10

"Actually,there were a lot of Chinese going back to the People's Republic of China at that time, ninety-thousand in one year from Fukien Province alone.

VOA: special.2011.06.10

The Coast Guard Academy can have thirty-five international students at any one time;

VOA: special.2009.06.04

The average age at that time was twenty-one.

VOA: special.2009.03.10

He tested the free-diving self-propelled submersible - one of only two in existence at the time - on increasingly deep dives off the California coast.

VOA: standard.2010.06.21