1 used to show that you are talking about a particular thing or person that has already been mentioned, is already known about, or is the only one 〔用于表示你正在谈论一个已经提到过、已经知道、或者是唯一存在的人或物〕
总理亲自出面干预。
5 used to refer to something that everyone knows because it is part of our natural environment or part of daily life 〔用来指自然界或日常生活中大家都知道的某事〕