在某事上花钱;
Some employers go to the expense of offering classes to improve workers'English.
有些雇主花钱开培训课来提高工人的英语水平.
You don't need to go to the expense of helping others this time.
这次你不需要再为了帮助别人而破费了.
It's foolish to go to the expense of getting a piano teacher.
花钱去找个钢琴教师是犯不着的.
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