1984 book: chapter 4: what happens when all the corrections are made to a document?

When all the corrections are made to a document, the original one is "vaporized" to ensure the "truth". This means that "corrections" or "rectification" of details were made,  to ensure the message or the reality they wanted to show. These messages include political propaganda, or manipulation of truth.

(you didn't attach a copy of the poem, but i'm answering as best as i can)

since a simile compares two unlike things using like or as, it kind of gives an item the ability to do something it can't.

example: "the player was like a tiger on the field"

in this sentence, the simile conveys the idea that the player was fast and strong, like a tiger.