你必须让公司觉得对于公司将来的成功来说，你的才能和贡献是必不可少的。
The company must view your talents and contributions as essential to the company's future success.
克林顿宣称，美国的全球主导作用仍是必不可少的，美国在新世纪里“能够、需要也必将”发挥主导作用，尽管美国必须通过新的方式来这样做。
Clinton declared that U.S. global leadership remains essential and that the United States "can, must and will" lead in the new century, even if it must do so in new ways.
尽管普遍认为数据备份是一个必不可少的业务过程，但是了解哪些数据必须备份以及哪些数据不应该备份也很重要。
Though backing up of data is universally accepted as a mandatory business process, it is also important to understand what data must be backed up and what data should not be backed up.
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