expense/ ɪks'pεns /

1.noun [c/u] 
(cost) 费用

2.n pl
expenses 经费

to go to the expense of doing sth
花钱于做某事
at great expense
以很大代价
to do sth at one's own expense
自己花钱做某事
at the expense of
以…为代价
to make a joke at sb's expense
说笑话让某人出丑
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