How to present this ancient poem to Wang Lun?

. "Peach Blossom Lake is deep in thousands of feet, not as good as Wang Lun." What rhetorical devices are used in these two poems? The Chinese teaching reference book says, "This sentence is a figurative sentence. It's an exaggeration to describe the depth of the Peach Blossom Pond with' the depth of thousands of feet', but the poet thinks it's not as good as the deep friendship expressed to Wang Lun when he bid farewell. It's endless. " And further pointed out: "The last two lines of the poem" To Wang Lun "are skillfully used in metaphor and exaggeration, and the poet's strong sigh should be appreciated by students." "exaggeration" is obvious. But "metaphor" or "contrast" made me and my students suspicious. Let's call it "metaphor" for a reason, because affection is an abstract concept and cannot be measured. So, how can readers deeply feel the affection between the poet and his good friend Wang Lun? The poet skillfully used the Peach Blossom Pond as a metaphor. Both "love" and "Peach Blossom Pond" have the same characteristics as "depth", so using metaphor can transform abstract concepts into sensible things, which are more easily understood and accepted by people. There is also a reason to say "contrast", because "less than" means less than, less than. Comparing the depth of Taohuatan with the feeling of parting, the result highlights the feeling of parting. Is there a problem with this analysis? I'm looking for information, but I still think "comparison" is more appropriate. This is a kind of "contrast ratio" in "contrast", which is expressed by the relative word "less than", emphasizing that the latter's "farewell feeling" is deeper than the former's "peach blossom pool water"