1·Taking out travel insurance may seem an unnecessary expense, but it is a must.
旅游保险费用看起来似乎是没必要的，但却是必不可少的开支。
—— 《柯林斯英汉双解大词典》
2·It would've been an unnecessary expense.
这将成为一比没有必要的费用。
3·Terry: I will see if I can cut down any unnecessary expense.
泰瑞：我看看还能不能削减任何不必要的费用。
4·Crow says he eventually convinced Mr. Jobs it was an unnecessary expense.
克劳说，自己最后说服了乔布斯，让他相信这是不必要的开销。
5·XCache avoids the costly and (strictly) unnecessary expense of recompiling the same PHP code to deliver a page.
XCache将避免代价高昂且(严格来说)不必要的花费来重新编译相同的PHP代码去交付一个页面。
6·I think this an unnecessary expense, but Lupin said he had had a piece of luck, having made three pounds out a private deal in the City.
我认为这是不必要的花费，但卢宾说他最近运气好，在城里做私人交易挣了三英磅。
7·A. Acting or producing effectively with a minimum of waste, expense, or unnecessary effort.
用最少的浪费、开销或不必要的工作来有效地生产。
8·You did spend too much, and most of the expense was kind of unnecessary.
你花钱太多了，而且大多数花费都是不太有必要的。
9·You did spend too much, and most of the expense was kind of unnecessary.
你花钱大手大脚，而且大多数钱都花得没有必要。