A buff is someone who has a strong, special interest in something.

VOA: special.2009.05.17

Theory was both hot and cool, and it was something about which, following from that, one had not just opinions but very, very strong opinions.

理论很热门，也很酷，对于理论，人们不光有想法，而且是非常强烈的想法。

耶鲁公开课 - 文学理论导论课程节选

Because it will allow you to express strong feelings about not liking something or not wanting something.

因为它能帮助你表达一种厌恶或不想做某事的强烈情绪。

I hate 课堂 - SpeakingMax英语口语达人

If the so called "double dip" scenario happens,in which the economy starts to shrink again, Baily says it would make a strong case for a second stimulus something the Obama administration hopes will not be necessary.

VOA: standard.2009.12.20

It's - a suture or a stitch has to hold the wound closed so it has to have certain mechanical strength and imagine the problem of making something that's dissolvable so it disappears but also is strong enough to hold a wound closed reliably for a length of time.

能够拉紧切口的缝合线,就必须具有一定的机械张力,大家想像一下制造这种缝合线的难度,身体组织不仅要能吸收这种缝合线,而且这种线必须有足够的张力,一定时间内能够拉紧切口

耶鲁公开课 - 生物医学工程探索课程节选