它们令采购者自责不已，因为它们是冲动性购物的见证；同时，它们更是繁琐的报销流程中必不可少的内容。 但是，将收据归档保存却是件棘手的麻烦事，如果不慎遗失，情形还会更糟糕。

Talismans of buyers' remorse, impulse decision-making and reimbursement migraine, receipts are bothersome to file and even worse to lose.

youdao

在整个20世纪大部分时间里，商业计划是任何新企业必不可少的内容。

Throughout much of the 20th century a business plan was indispensable for any new business venture.

youdao

因为您可以使用这个服务在知识库中获取根集，从而开始内容导航，所以这个服务是必不可少的。

It's a required service because it's the service that you use to get the root collection in the repository so that you can start to navigate content.

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