"Perhaps most important,though, we can now field initial elements of the system to protect our forces in Europe and our allies roughly six to seven years earlier than the previous plan a fact made more relevant by continued delaysin the Czech and Polish ratification processes that have caused repeated slips in the timeline,".

VOA: standard.2009.09.17

But vaccines, and particularly in the last hundred years, vaccines have been one of the most important elements in our progress.

但是疫苗,尤其是在近一百年来,疫苗已经成为,感染性疾病防治进程中最重要的一环

耶鲁公开课 - 生物医学工程探索课程节选

There are certain important elements.

其中有一些重要的元素。

耶鲁公开课 - 旧约导论课程节选

And again, there'll be key elements that run in cycles and understanding those can be extremely important in understanding how cellular function works.

同样地，在循环中也会有,一些关键的要素,研究这些对于理解细胞的,运作机制是极其重要的。

麻省理工公开课 - 热力学与动力学课程节选

That is important, that elements, because they are the building blocks, they combine in whole number multiples.

这很主要，元素，因为它们在组成区块，它们化合成整数倍。

麻省理工公开课 - 固态化学导论课程节选