从字典中得来
expense的可不可数
随意义而改变
expense
n
[U]不可名词 spending of money etc; cost 花费; 代价:
an expense of time,energy and cash 时间、 精力、 现金的花费 *
[C] 可数名词cause of spending 花费的原因:An annual holiday is a big expense.一年一度的假日是一笔大开销.* Running a car is a great expense.一辆汽车的经常开支很大.
expenses [pl] money spent in doing a specific job,or for a specific purpose （做某工作或为某目的）花费的钱:
travelling expenses 旅费
* House repairs,holidays and other expenses reduced her bank balance to almost nothing.修房、 度假和其他开销使她在银行的存款所剩无几.*