1.Previous approaches to producing red blood cells have relied on various sources of stem cells which can only presently produce very limited quantities.
rely on信赖;依赖
He can rely on my support when the crunch comes.
关键时刻,他可以依靠我的支持 。
2.Professor David Anstee, another of the researchers, told the BBC that his team has found a way to mass produce blood, but they now need the technology to actually do this on a large scale.
on a large scale大规模地
This movement has aroused the masses on a large scale.
这次运动,群众发动的面很广 。