增压的一个关键因素，是机身承受结构内部压力，与外部环境压力增加所产生的力的能力。

A A critical factor in pressurization is the ability of the fuselage to withstand the forces associated with the decrease in pressure outside the structure versus the ambient pressure inside;

B A critical factor in depressurization is the ability of the fuselage to withstand the forces associated with the increase in pressure inside the structure versus the ambient pressure outside;

C A key factor in pressurization is the ability of the fuselage to withstand the forces associated with the increase in pressure inside the structure versus the ambient pressure outside;