He is astonished that so many researchers have failed to include female animals in their studies.

他很震惊，那么多的研究者在研究中没有包括雌性动物。

youdao

Many researchers have long believed that gliders such as this were the ancestors of modern birds.

许多研究者一直相信像这样的滑翔者是现代鸟类的祖先。

youdao

What those causes are is unknown, but many researchers have speculated that urban social environments are partly responsible.

原因究竟何在还尚不知晓，不过，许多研究人员推测城市的社会环境在一定程度上难辞其咎。

youdao

The researchers say many, if not all,people likely have these antibodies but do not always produce or use them efficiently.

VOA: special.2009.03.04

Researchers have linked the failure to identify and express emotions to many health conditions.

VOA: special.2009.03.24

For many years, researchers have studied why the space environment weakens bones.

VOA: special.2009.03.10

Right now, most trials are funded by industry, which explains the focus many researchers have had on new drugs.

FORBES: AHA Meeting

The science behind the test itself is not new - many researchers have been working on the possibility of breath tests for a number of cancers, including lung.

BBC: Stomach cancer 'spotted by breath test'

For many years researchers have been investigating designs that might be able to provide such protection by incorporating liquids.

ECONOMIST: Monitor: Fluid defences | The