This sentence is a couplet of Du Fu's "The Guest Arrives", and the poet turns his brush strokes to the courtyard, which leads to "The Guest Arrives". The author adopts the tone of talking with the guest, which enhances the real sense of life of the guest and the host. The last sentence said that the courtyard path full of flowers and plants has not been cleaned for welcoming guests. The next sentence says that the door that has always been closed has only been opened for you for the first time today. Lonely, the guests are coming, and the owner who has always been leisurely and quiet can't help but be overjoyed. These two sentences, set off before and after, have deep feelings. Not only does the lobbyist not come often, but the host doesn't delay the guest's intention easily. Today, the "gentleman" comes, which is beneficial to see the deep friendship between the two, so that the happiness behind him has landed. The meaning of the former sentence is more detached by the "starting from today" in the latter sentence, which complements the first two sentences.
meaning of the poem: it expresses sincere and attentive affection for friends.