In "a berth at the foot of the North Fort Mountain", the sentence that best reflects the poet's homesickness is

I can finally send my messenger, the wild goose, back to Luoyang.

"A berth under the Beibao Mountain" is a famous work that has been told for generations, among which "The embankment widens until the ebb tide, and there is no wind blowing my solitary sail" and "The embankment widens until the ebb tide" ... "Night now gives way to the ocean of the sun, and the old year melts in the clear spring" are highly praised famous sentences. This poem depicts the Jiangnan scenery with green mountains and green waters and flat tides and broad shores that the poet saw when he was parked at the foot of Gubei Mountain. However, with the approach of the Spring Festival, the geese overhead sighed, "My emissary can finally be sent". The whole poem is full of beautiful artistic conception and mixed scenes, which expresses the poet's deep homesickness when he lives abroad.