decide on 就…做出决定,决定要
Peter decided on a blue sweater.
彼得选定了一件蓝色的运动衫.
OK,I have decided on buying the jacket.How much is it?
好吧,我已经决定买这件夹克衫了.多少钱?
He has decided on where to go.
他已经决定去哪儿.