先理解核心含义，再看它在真实句子里的用法。
花费；开支
the amount of money spent on something
We need to cut down on unnecessary expenses to save money.
我们需要削减不必要的开支来省钱。
The company will cover the expense of your travel to the conference.
公司将承担你前往会议的费用。
AI contextual example
He spared no expense to make the party unforgettable.
他不惜代价让派对令人难忘。
AI contextual example
at the expense of
WordNet
he kept a careful record of his expenses at the meeting
WordNet
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Dictionary facts from ECDICT.