项目经理大可放心，在敏捷项目里他们的作用非常重要，不仅如此，对于大型项目的成功，他们也是必不可少的。
Project managers can be assured that there is a strong role for them on agile projects. Project managers are not only important but absolutely necessary for the success of large scale projects.
合同作为国际商务活动中一个必不可少的部分，起到了非常重要的作用。
As a necessary component part in international business, the contracts play a very important role.
通讯在过去和现在都是非常重要的，在现代社会里通讯更是必不可少的。
Communication is very important both in the past and at present and tends to be more essential in modern society.
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