| 词汇 | eyeballs in eyeballs out |
| 词源 | eyeballs in, eyeballs out. Test pilots in the 1960s coined this term to describe the physical effect of acceleration on the person being accelerated. For example, the acceleration experienced by an astronaut at lift-off is eyeballs in, while the expression of an astronaut when the retrorockets fire is eye- balls out. |
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