There has been a great effort, which will continue over the next two years, to reduce this debt...a millstone that is essential and indispensable.
我们已经并将在未来两年内继续为此而努力，这将是俱乐部史上不可缺少的里程碑式的举动。
A development environment contains everything required by a team to build and deploy software-intensive systems (where software is an essential and indispensable element).
一个开发环境包含了一个团队构建和部署软件系统(在这里软件特别重要，不可或缺的元素)所需要的一切条件。
Just as struts are essential to the structure of a wing, struts might become an indispensable part of your next Web project.
正像翼间支柱是机翼结构中不可缺少的一部分一样，Strut也可能成为您下一个Web项目的不可缺少的一部分。
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