absolute ceiling

1. At this absolute assertion, the Jondrette woman raised her large, red, blonde face and stared at the ceiling with a horrible expression.
   听见这斩钉截铁的话，容德雷特婆娘抬起一张又红又白的宽脸，用一种奇丑的神情，注视着天花板。

noun

1. the maximum altitude at which an airplane can maintain horizontal flight