BBC news 2011-03-06 加文本

only, single, sole, unique, alone
这些形容词均可表示“唯一的”之意。
only : 普通用词，常可与sole换用，但侧重仅限于指定的人或物，而不需要更多。
single : 语气较强，强调仅此一个，再无第二个。
sole : 语气强于only，指仅有一个或一群，只考虑这一个或这一群。
unique : 非正式用词，侧重在一类中唯一无可匹敌、无与伦比的特征。
alone : 着重专指某人或某物，而不是别的。

2.The Saudi government has warned against any public protests, saying that they are illegal and against the teachings of Islam.

warn against告诫, 当心, 提防

例句：He warned me against pickpockets.
      他让我提防小偷。

      The doctor warned the patient against smoking.
      医生告诫病人不要吸烟。

3.International football authorities have stepped into the world of fashion and banned snoods, or neck-warmers, for footballers.

step into干预; 涉足

例句：After graduation John stepped into his father's shoes to become a lawyer.
      约翰毕业后便继承了他父亲的衣钵, 当了一名律师。

4.The suggestion was that opponents might grab the snood when a player was running at speed.

at speed高速地, 快地

例句：She finished typewriting the letter at speed.
      她迅速打好那封信。

      Tom was driving his sports car at an unbelievable high speed.
      汤姆正在以令人难以相信的高速驾驶着自己的跑车。