By contrast , scientists working with priate money hae been deeloping embryonic stem cell lines that are hardier , less demanding , and not dependent on mouse cells .
Though some hardier souls say that in bad times people need the arts even more ( and I agree ) , we would be foolish not to be concerned .
虽然一些胆子更大的人说,坏年景里,人们更加需要艺术(我也同意),但要说不担心,那不是傻子吗。
They 'd all need to be hardier and thicker-skinned than current humans , in order to deal with the greater influx of cosmic radiation they would experience in the absence of a geomagnetic field .
Plants that were bred prior to world war ii are naturally hardier because they were established - and thrived - before the development of modern fertilizers and pesticides .
早于二次大战生长的植物自然生命力更强,因为它们在现代化肥和农药发明之前就开始种植,并长势喜人。
Drought-resistant crops ( including genetically modified ones ) reduce the amount of water plants draw from the soil-an environmental plus-and are hardier , raising returns to farmers in bad years .
The calves have about a 20 % mortality rate , so mating with bigger females could increase a male 's chance of reproductive success by siring larger , hardier offspring , pack says .
亚当包说雄性有20%的死亡率,因此与强壮的雌性结合可能增加雄性成功产强壮后代的几率。
Yet corals may be hardier than biologists have thought .
但是珊瑚也许比生物学家想得要更坚强。
Hardier creatures soon face another threat : people .
命硬的动物很快还会面临来自人类的威胁。
Theoretically , experiments with genes that confer resistance to disease or herbicides could create hardier weeds .