How many units have you sold recently?
最近你已经销售了多少（某产品）了？
How many units have you learned already?
你们已经学了多少个单元了？
Do you remember how many units of blood you received?
你记得当时他们给你输了多少单位的血吗？
It was enough to make an educated guess about how many units we might sell.
这就足够做出有依据的销售量猜测了。
Currently, the country engaged in "mechatronics" research and development and production of many units.
目前，我国从事“机电一体化”研究开发及生产的单位很多。
Currently, the country engaged in "mechatronics" research and development and production of many units.
目前，我国从事“机电一体化”研究开发及生产的单位很多。
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