spend.on spend.in 与spend.doing的区别

spend / spend; spnd/ v (pt,pp spent / spent; spnt/) [I,Tn,Tn.pr] sth (on/sth) give or pay out (money) for goods,services,etc 用（钱）; 花（钱）:He spends as if he were a millionaire.他用起钱来像个百万...