This often increases the number of individuals collected and attracts species that are otherwise elusive.

这通常会使收集到的个体数量增加，并吸引其他难以捕捉的物种。

youdao

If the population of these other species were increased, the number of ticks acquiring the bacterium and hence the number of people contracting Lyme disease would likely decline.

如果这些其他物种的种群数量增加，蜱类捕获细菌的数量就会减少，因此感染莱姆病的人数就会减少。

youdao

The aim is to reverse the decline in the number of tree species or at least to preserve the "genetic material" of all of them.

其目的是扭转树种数量下降的趋势，或至少保存所有树种的“遗传物质”。

youdao

One hundred thirty-nine wetland species have increased in number since the late nineteen-seventies.

VOA: special.2009.05.12

The number of species in an area is written near its name.

VOA: special.2010.04.06

They are fantastic." Monica Jimenez and her daughters came from Colombia, a country that has a large number of orchid species.

VOA: standard.2010.02.21

This plummeted over 80% when the dam began operation, and a decade later, through extensive government investment to restock the river, the species number is still less than half the original amount.

CNN: STORY HIGHLIGHTS

The other is that upgrading subspecies into species simultaneously increases the number of rare species (by fragmenting populations) and augments the biodiversity of a piece of habitat and thus its claim for protection.

ECONOMIST: Species inflation

Darwin showed in detail how life changes over the course of time by the process of natural selection, but failed to explain how those changes can take different courses, dividing a species in two and thus multiplying the number of species.

ECONOMIST: Evolution