A number, group, set, or thing lacking no part or element; a complete thing.

总数、一组、一套或不缺少任何部分或元素的事物；完整的事物。

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The National Council on Teacher Quality is a research group that works to increase the number of effective teachers.

VOA: special.2011.08.11

The census form asks ten questions, including the number of people living in each house, their ethnic group and race.

VOA: special.2010.05.07

The scientists found that the affected bees had a number of viruses from a group called picorna-like viruses.

VOA: special.2009.09.22

Those guests might not be able to stay long, though: with a number of group bookings scheduled for later in the week, the walk-in guests may have to find other arrangements.

CNN: Fire affects TV shows, celebrities

The number two player, Aon, may get tarred in Spitzer's investigation, but number three Willis Group is poised to pounce.

FORBES: Pulling the Plug on Marsh

And Number One Food Group, which was to feature Greg Norman pasta sauce and other foods, never got off the ground.

FORBES: Norman's conquest