What is relevant about the fact that the sign "quavers under a film" of water at the beginning of the story? "From a sound of thunder"

Bradbury´s opening uses the literary device of personification by granting a human trait (the capacity to tremble because of weakness) to a non-living thing (the sign on the wall). This sentence also works as a foreshadowing element, as it sets the mood for something going wrong.

Explanation:

Furthermore, it relates to a later metaphor about time being "a film run backward." In the end, the protagonist finds himself trembling because of his weakness, his incapacity to go through the film of time without causing trouble.

major league baseball

explanation:

jack roosevelt robinson broke the color barrier in major league baseball.as he was the first african american to play in the major leagues, jackie robinson became the target of racial abuse. jackie robinson is referring to the historic event, harlem riot.

tu caminas en las clase de educacion fisica.

its translates: do you walk in in your physical education class?