(noun.) the overhead upper surface of a covered space; 'he hated painting the ceiling'.
(noun.) (meteorology) altitude of the lowest layer of clouds.
(noun.) maximum altitude at which a plane can fly (under specified conditions).
(noun.) an upper limit on what is allowed; 'he put a ceiling on the number of women who worked for him'; 'there was a roof on salaries'; 'they established a cap for prices'.
录入:劳伦斯
校对:西尔玛