"The fight against terrorists and violent extremists has been returned to its right and proper place -no longer defining, indeed,distorting, our entire national security and foreign policy, but rather serving as a vital part of those larger policies,"

VOA: standard.2009.08.06

It emerged from a unique history in which chance and accident often played a vital part.

它出现在这段独特的历史中,其中机遇和偶然性扮演了重要角色

耶鲁公开课 - 古希腊历史简介课程节选

It's very important because it provides-- does provide energy but it helps with muscle building and with the manufacturing the body does of its own proteins, and therefore, is a vital part of the diet.

蛋白质非常重要,因为它能提供,的确能提供能量,但它也能帮助肌肉塑形,参与身体内自身蛋白的合成,因此是饮食中不可或缺的组成部分

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And now with Antarctic science being really a global science and part of understanding how the world works, it is becoming really vital that everybody works together."

VOA: special.2009.06.03