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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。
