When you arrive at your room in a hotel， locate the emergency exits. It only takes a minute.

Every discovery in science opens up a new set of questions, and that's what makes it so exciting.

世界上充满了自童年起就再未以开放心灵面对开放门户的人。

我觉得布什总统根本没有为艾滋病做任何事。事实上，我都不能确定他会不会拼艾滋这个单词。