The parallel structure revision for the sentence is OC. Escaping the pull of gravity and traveling at high speeds both affect the rate at which time passes.
The revised sentence using parallel structure is:
OC. Escaping the pull of gravity and traveling at high speeds both affect the rate at which time passes.
This revision maintains parallel structure by using the correlative conjunction 'both...and' to link the actions 'escaping the pull of gravity' and 'traveling at high speeds.' By doing so, the sentence is grammatically correct and clear for the reader.
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