这个条约是政府外交政策最重要的一环。
This treaty is the centrepiece of the government's foreign policy.
学龄前的教育是整个教育中最重要的一环。
The pre-school education is the most important of the whole education.
现在这一步就是整个流程中最重要的一环。
This is one of the most important steps in the whole procedure.
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
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